Eco Hvar

Insect spraying: rethink needed

The campaign to eliminate mosquitoes through routine insect spraying is not working! And it's dangerous. We at Eco Hvar are asking for change.

Insect spraying: rethink needed

INSECT SPRAYING ON HVAR

From Jelsa Council: "The insect spraying programme, as a means of protecting the population against infectious diseases is carried out in order to eliminate mosquito larvae, thus removing the possibility for mosquitoes to develop and multiply, in this way reducing damage to the environment and people" (e-mail, 11.08.2017.)*

WHY WE ARE WORRIED

Infectious diseases like Dengue and West Nile Fever are extremely rare in Croatia1,2,3,4. Despite this, insect spraying in the form of 'fogging' against adult mosquitoes is carried out on Hvar three times during the high summer tourist season, and there are separate actions against mosquito larvae and flies at various times throughout the year.

The insect control actions have been carried out for years without adhering fully to the regulations laid down by the County Public Health Institute: 

i) for the fogging, dangerous chemical pesticides are spread all over the environment;

ii) the very serious possible adverse effects of the pesticides have not been advertised; 

iii) little or no use has been made of environmentally-friendly alternatives to poisons;

iv) there is no public education about pest control;

v) warnings about the 'fogging' actions are totally inadequate;

vi) the routes taken by the 'fogging' vehicle are not made public;

vii) the fogging spraying has been done without regard to the vineyards, olive groves, orchards and vegetable plots alongside the roads, so that substances which are not authorized to be used on plants enter the food chain nonetheless (see 'Pesticides, Laws and Permits' for more details about authorizations);

viii) the larvicide and fly control measures are not publicized at all;

ix) at local level, it seems that the poison spraying programme is not under strict supervision and control, as it should be according to the regulations;

x) it seems that no-one at local or national level is monitoring the effectiveness and possible ill-effects relating to the spraying programme: despite regular insect suppression measures, every year there are increasing numbers of mosquitoes, as they become resistant to the poisons used 5,6,7; at the same time, there has been a visible significant decline in numbers of birds. bats, and beneficial insects. Monitoring of invasive mosquito species was started in Croatia in 2016, but since then it has been limited in scale, and there has been no monitoring of any kind on Hvar, to our knowledge.

2011: Warning to beekeepers, Croatian Beekepers' Association, but such warnings have been patchy over the years

DETAILS OF THE POISONS

POISONS USED: In 2012, two pyrethroid insecticides were used on Hvar for the 'fogging', a combination of Permethrin and Cypermethrin; in 2014, the spray used across the Jelsa Council area was Permex 22E (active ingredients Permethrin and Tetramethrin, in combination with a synergist, Piperonyl Butoxide); in 2015 Microfly (Cypermethrin),and Twenty-one (Azamethiphos) were used against flies; in 2017, fogging in the Hvar Town, Stari Grad and Jelsa rtegions was carried out using Permex 22E, while Cipex (Cypermethrin). Microfly (Cypermethrin) and Muhomor (Azamethiphos) were used against flies around the rubbish bins and rubbish dumps. Azamethiphos is an organophosphate, the others are pyrethroids. The combined effects of such chemical pesticides on environmental and human health are not known

Pyrethroids8 are dangerous poisons 9,10,11. Each of the poisons is dangerous in its own right, not only for insects but for other living creatures. In 2017, overnight 'fogging' took place in June, July and August. The street spraying is indiscriminate, spreading poison over houses, terraces, gardens, fields, and any hapless humans or animals who happen to get in the way. 

ABOUT THE INSECTICIDES USED IN THE JELSA COUNCIL AREA, 2017

Cipex - active ingredient Cypermethrin12 (pyrethroid). Cypermethrin is very toxic to cats13, bees, aquatic insects and fish, and to a lesser degree to birds. In humans, Cypermethrin poisoning can give rise to numbness, burning, loss of bladder control, vomiting, loss of co-ordination, coma, seizures, and (rarely) death 14,15,16. It is classified in the United States as a possible cause of cancer17.

Permex 22E- the two active pyrethroid ingredients of Permethrin and Tetramethrin. Permethrin 18,19,  comes in many different formulations, some more poisonous than others. It is highly toxic to bees, sea organisms, fish20 and other animals21. It is also poisonous to cats22. The possible ill-effects on humans are considered less dramatic than those of Cypermethrin, but it can cause neurological damage23,24, as well as problems in the immune and endocrine systems. It can have a particularly bad effect on children, and the American Environmental Protection Agency classified it as a potential carcinogen in 2006.25 Given their known ill-effects on aquatic life-forms, pyrethroids must not be used near water sources. Also Permethrin is not allowed on places where animals forage for food.

The EPA registration document for Tetramethrin (2010)26 classified it as a potential human carcinogen, and identified it as extremely toxic to bees and aquatic organisms, including fish and aquatic invertebrates. It can cause dizziness, breathing difficulties, coughing, eye irritation, gastrointestinal upset, blisters and skin rashes. The EPA document stated that: "Tetramethrin is used by individual home-owners or industrial / commercial property owners, in individual, isolated areas, and in small amounts as opposed to wide scale uses (i.e., for agriculture or mosquito abatement by public authorities)." 27 For this reason, they did not test the effect of Tetramethrin on drinking water. Tetramethrin is not supposed to be used on or near foodstuffs27.

The synergist Piperonyl Butoxide in Permex 22E carries harmful effects of its own, as it is highly toxic to aquatic life, with long-lasting effects (ECHA infocard)

Microfly - active ingredient Cypermethrin (see above, under Cipex).

Muhomor - active ingredient Azamethiphos28, an organophosphate poison which is not on the list of insecticides approved in the European Union.29,30. The instructions state that it should only be applied to target surfaces, and not sprayed in the air. Muhomor AZ was the product used for spraying around dustbins and rubbish dumps on Hvar in 2017. It is a water-soluble insecticide designed to eliminate flies in stalls for cattle, calves, horses, pigs, and chickens31. It is mostly used in enclosed spaces. As at September 2021, it was not on the list of products authorized by the European Chemicals Agency.

INSECTICIDES USED IN THE HVAR TOWN AREA, 2017

According to the published Programme of Measures for Compulsory Pest Control 2017, published by the Town Wardens' Office, five pyrethroids were listed for use in the summertime 'fogging' actions: Cypermethrin, Deltamethrin32, D-Phenothrin33, Permethrin and Resmethrin34 (p.9, table 2 in the Programme). Phenothrin is especially toxic to cats35, bees36 and aquatic organisms37. Resmethrin is particularly poisonous to fish, also to birds, and is potentially harmful for humans38. It has been banned from sale in the United States since 201539.

BEES: All the poisons named here are toxic to bees. As long ago as 1998, Permethrin, d-Phenothrin and Resmethrin were included in a list of insecticides known to be particularly harmful to bees, with effects lasting even some time after application40.

RE THE WARNINGS AND ANNOUNCEMENTS. We are talking here about very dangerous substances, yet warnings are minimal: Jelsa Council places a letter from the firm which carries out the poison spraying on the Council's public notice boards. Stari Grad announces it on its website. There is no warning through the media, nothing via the Tourist Offices. Beekeepers are not given special warning, even though they stand to suffer loss. The warnings are not given in any language other than Croatian, even though the spraying takes place during the high season when Hvar is teeming with foreign tourists.

Local citizens and visitors have the right to be fully informed about the spraying programme. There should be public announcements, detailing the substances to be used and their possible adverse effects; the complete map of the route the 'fogger' will take; the method of administering the spray; and the precise timing of the action.

Local authorities which order the 'fogging' actions are duty-bound to inform local inhabitants and guests through all available channels, and in all relevant languages.

Public warning - but did anyone notice?

CONCLUSIONS

The insect suppression programme as carried out on Hvar over the past few years is potentially damaging for human health, also for animals, birds, non-target insects and the environment. The programme is not achieving its aims. The way in which it is being carried out is irresponsible. not transparent, and on many counts unacceptable.

WE RECOMMEND:

Given that the risks of infectious diseases from mosquitoes are small, while the risks of spraying poisons over public areas are much greater, the current programme of summer spraying should be stopped as a matter of urgency, and alternative methods of controlling unwanted insects should be explored, as allowed for in the Regulations governing compulsory insect control.

A tactic: poison companies use cartoon images to mask the serious risks from mass insecticide spraying

© Vivian Grisogono MA(Oxon) 2017, amended September 2021.

* Original: "program dezinsekcije kao mjere zaštite pučanstva od zaraznih bolesti provodi se kako bi se suzbila ličinka komaraca te uklonili uvjeti za razvoj i razmnožavanje, a time smanjila šteta za okoliš i zdravlje ljudi."

FOOTNOTE: For more details about the pesticides used on Hvar, their possible adverse effects, and up-to-date information on their EU approval status, see our articles 'Pesticides and their Adverse Effects' and 'Pesticide Products in Croatia'. For an explanation of the approvals processes in the EU and Croatia, see 'Pesticides, Laws and Permits'

POISON SPRAYING ON HVAR: REFERENCES

1. Gjenero-Margan, I., Aleraj, B., Krajcar, D., Lesnikar, V., Klobučar, A., Pem-Novosel, I., Kurečić-Filipović, S., Komparak, S., Martić, R., Đuričić, S., Betica-Radić, L., Okmadžić, J., Vilibić-Čavlek, T., Babić-Erceg, A., Turković, B., Avšić-Županc, T., Radić, I., Ljubić, M., Šarac, K., Benić, N., Mlinarić-Galinović, G. 2011. Autochthonous dengue fever in Croatia, August–September 2010. Eurosurveillance, 16 (9).

2. Pem-Novosel, I., Vilibic-Cavlek, T., Gjenero-Margan, I., Kaic, B., Babic-Erceg, A., Merdic, E., Medic, A., Ljubic, M., Pahor, D., Erceg, M. 2015. Dengue virus infection in Croatia: seroprevalence and entomological study. New Microbiologica, 38, 97-100.

3. Barbić L, Listeš E, Katić S, Stevanović V, Madić J, Starešina V, Labrović A, Di Gennaro A, Savini G. 2012. Spreading of West Nile virus infection in Croatia. Veterinary Microbiology. 159(3-4):504-8.

4. European Centre for Disease Prevention and Control. (Provides regular updates on the spread of communicable diseases in Europe)

5. Weill, M., Lutfalla, G., Mogensen, K., Chandre, F., Berthomieu, A., Berticat, C., Pasteur, N., Philips, A., Fort, P., Raymond, M. 2003. Comparative genomics: Insecticide resistance in mosquito vectors. Nature 423: 136-137 (8 May 2003)

6. Owusu, H. F. Jančáryová, D., Malone, D., Müller, P.. 2015. Comparability between insecticide resistance bioassays for mosquito vectors: time to review current methodology? Parasites and Vectors 8: 357

7. Aguirre-Obando, O. A., Pietrobon, A. J.. DallaBona, A. C., Navarro-Silva, M. A. 2015. Contrasting patterns of insecticide resistance and knockdown resistance (kdr) in Aedes aegypti populations from Jacarezinho (Brazil) after a Dengue Outbreak. Revista Brasileira de Entomologia 60:1 94-100 (January–March 2016)

8. EPA Information Sheet. 2016. Pyrethrins and Pyrethroids. (information on the use of pyrethrins and pyrethroids as insecticides, the current reevaluation of this group of pesticides in registration review, and previous assessments, decisions, and risk mitigation efforts.)

9. Beyond Pesticides. 2001. chemicalWATCH factsheet: Synthetic Pyrethroids.

10. Walters, J.K., Boswell, L.E., Green, M.K., Heumann, M.A., Karam, L.E., Morrissey, B.F., Waltz, J.E. 2009. Pyrethrin and Pyrethroid Illnesses in the Pacific Northwest: A Five-Year Review. Public Health Reports 124 (1): 149-159

11. Ingram E.M., Augustin, J., Ellis, M.D., Siegfried, B.D. 2015. Evaluating sub-lethal effects of orchard-applied pyrethroids using video-tracking software to quantify honey bee behaviors. Chemosphere 135: 272-277

12. TOXNET Toxicology Data Network (U.S.National Library of Medicine). Cypermethrin.

13. PARASITIPEDIA.net. updated 2017. CYPERMETHRIN, safety summary for veterinary use.

14. Cornell University, (Extoxnet). 1993. Pesticide Information profile: Cypermethrin.

15. PubChem Open Chemistry Database. 2005. Cypermethrin.

16. Aggarwal, P., Jamshed, N., Ekka, M., Imran A. 2015. Suicidal poisoning with cypermethrin: A clinical dilemma in the emergency department. Journal of Emergencies, Trauma and Shock. 8:2 123-125.

17. U.S. Environmental Protection Agency Office of Pesticide Programs. 2016. Chemicals Evaluated for Carcinogenic Potential. Annual Cancer Report.

18. World Health Organization. 2006. "International Program on Chemical Safety, Environmental Health Criteria 92: Permethrin."

19. U.S. Environmental Protection Agency. 2002. "TRI Explorer: Providing Access to EPA's Toxic Release Inventory Data."

20. U.S. Environmental Protection Agency. August 2009. Permethrin Facts.

21. Hoffmann, M., Meléndez, J.L., Ruhman, M.A., 2008. Risks of Permethrin Use to the Federally Threatened California Red-legged Frog (Rana aurora draytonii) and Bay Checkerspot Butterfly (Euphydryas editha bayensis), and the Federally Endangered California Clapper Rail (Rallus longirostris obsoletus), Salt Marsh Harvest Mouse (Reithrodontomys raviventris), and San Francisco Garter Snake (Thamnophis sirtalis tetrataenia). Environmental Fate and Effects Division Office of Pesticide Programs, Washington, D.C. 20460

22. International Cat Care. Permethrin Poisoning in Cats.

23. U.S. Centers for Disease Control (ATSDR). 2003. "Toxicological Profile for Pyrethrins and Pyrethroids."

24. U.S. Environmental Protection Agency. 2006. "Reregistration Eligibility Decision (RED) for Permethrin."

25. U.S. Environmental Protection Agency. 2007. Permethrin & Resmethrin (Pyrethroids), Toxicity and Exposure Assessment for Children's Health. TEACH Chemical summary.

26. U.S. Environmental Protection Agency. 2008, revised 2010. Reregistration Eligibility Decision Document for Tetramethrin.

27. Thoreby, E. (author), Williams, M.M. (editor), Lah, K. (updater) 2011. Tetramethrin. Toxipedia.

28. Scottish Environment Protection Agency. Azamethiphos. Scottish Pollutant Release Directory.

29. University of Hertfordshire. Azamethiphos. Veterinary Substances Database.

30. Pesticides Action Network (PAN) Europe. 2006. What substances are banned and authorized in the EU market?

31. Muhomor. 2017.  Muhomot je insekticid topiv u vodi. Djelatna tvar: Azametifos u koncentraciji 10%. Genera, Jedna komapnija za Jedno zdravlje.

32. PubChem, Open Chemistry Database. 2017. Deltamethrin.

33. PubChem, Open chemistry Database. 2017. D-Phenothrin.

34. US EPA Archive Document. 2007. Permethrin and Resmethrin (Pyrethroids). TEACH Chemical Summary.

35. Parasitipedia. 2017. Phenothrin: safety summary for veterinary use.

36. US EPA. 2008. Reregistration Eligibility Decision for d-Phenothrin.

37. WHO/FAO 1994. d-Phenothrin. WHO/FAO Data Sheet on Pesticides no.85.

38. PubChem Open Chemistry Database. 2017. Resmethrin.

39. US EPA. 2011. Permethrin, Resmethrin, d-Phenothrin (Sumithrin®): Synthetic Pyrethroids for Mosquito Control.

40. Alabama A&M and Auburn Universities. 1998. Protecting honey bees from pesticides.

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    Lions tussle in the tall grass of Mara North Conservancy.

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    © Will McCarry

    Elijah Toirai explains current conservancy boundaries and potential areas for expansion.

    Creativity from crisis

    In 2020, the entire conservancy model almost collapsed overnight.

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    © Will Turner

    A black-backed jackal hunts for prey.

    “But then the nature finance team at Conservation International — these crazy guys — came up with a wild idea,” Alie said. “In just six months they put this entirely new funding model together: loaning money at an affordable rate to the conservancies so that they can continue to pay staff and wildlife rangers.”

    Conservation International and the Maasai Mara Wildlife Conservancies Association launched the African Conservancies Fund — a rescue package to offset lost revenues for approximately 3,000 people in the area who rely on tourism income. Between December 2020 and December 2022, the fund provided more than US$ 2 million in affordable loans to four conservancies managing 70,000 hectares (170,000 acres).

    The loans enabled families in the Maasai Mara to continue receiving income from their lands to pay for health care, home repairs, school fees and more. And because tourism revenues — not government funding — support wildlife protection in conservancies, this replacement funding ensured wildlife patrols continued normally, with rangers working full time.

    Born out of this emergency, we discovered a new way to do conservation.

    Elijah Toirai

    “The catastrophe of COVID-19 was total for us,” said Benard Leperes, a landowner with Mara North Conservancy and a conservation expert at Maasai Mara Wildlife Conservancies Association. “Without Conservation International and the fund, this landscape would have not been secured; the conservancies would have disintegrated as people were forced to sell their land to convert it to agriculture.”

    But it was communities themselves that proved the model might be replicable after the pandemic ended.

    “The conservancies had until 2023 before the first payment was due,” Toirai said. “But as soon as tourism resumed in mid-2021, the communities started paying back the loans. Today, the loans are being repaid way ahead of schedule.”

    “Born out of this emergency, we discovered a new way to do conservation.”

    A new era for conservation

    The high plateaus overlooking the Maasai Mara are home to the very last giant pangolins in Kenya.

    These mammals, armored with distinctive interlocking scales, are highly endangered because of illegal wildlife trade. In Kenya, threats from poaching, deforestation and electric fences meant to deter elephants from crops have caused the species to nearly disappear. Today, scientists believe there could be as few as 30 giant pangolins left in Kenya.

    Conservancies could be crucial to bringing them back. Conservation International has identified opportunities to provide transformative funding for conservancies in this area — a sprawling grassland northwest of Maasai Mara that is the very last pangolin stronghold in the country. The fund will help communities better protect an existing 10,000-hectare (25,000-acre) conservancy and bring an additional 5,000 hectares under protection. It provides a safety net, ensuring a steady income for the communities as the work of expanding the conservancy begins. With a stable income, communities can start work to restore the savanna and remove electric fences that have killed pangolins. And as wildlife move back into the ecosystem, the grasslands will begin to recover.

    In addition to expanding conservancies around Maasai Mara, Conservation International has identified other critical ecosystems where community conservancies can help lift people out poverty, while providing new habitats for wildlife. Conservation International has ambitious plans to restore a critical and highly degraded savanna between Amboseli and Tsavo National Parks in southern Kenya, as well as a swath of savanna outside Kruger National Park in South Africa.

    © Emily Nyrop

    A lone acacia tree in a sea of grass.

    Elephants, fire, Maasai and cattle

    Many of the new and emerging community conservancies have been carefully chosen as key wildlife corridors that would be threatened by overgrazing livestock.

    When the first Maasai Mara conservancies were established in 2009, cattle grazing was prohibited within their boundaries. When poorly managed, cattle can wear grasses down to their roots, triggering topsoil erosion and the loss of nutrients, microbes and biodiversity vital for soil health. It was also believed that tourists would be put off by the sight of livestock mingling with wildlife.

    © Emily Nyrop

    Cattle are closely monitored in the Maasai Mara to prevent overgrazing.

    However, over the years, landowners objected, lamenting the loss of cultural ties to cattle and herding. “That was when we changed tactics,” said Raphael Kereto, the grazing manager for Mara North Conservancy.

    Beginning in 2018, Mara North and other conservancies in the region started adopting livestock grazing practices to restore the savanna. Landowners agreed to periodically move livestock between different pastures, allowing grazed lands to recover and regrow,  mimicking the traditional methods pastoralists have used on these lands for hundreds, if not thousands, of years.

    “Initially, there was a worry that maybe herbivores and other wildlife will run away from cattle,” said Kereto. “But we have seen the exact opposite — the wildlife all follow where cattle are grazing. This is because we have a lot of grass, and all the animals follow where there is a lot of grass. We even saw a cheetah with a cub that spent all her time rotating with wildlife.”

    “It's amazing — when we move cattle, the cheetah comes with it.”

    The loans issued by the fund — now called the African Conservancies Facility — will enhance rotational grazing systems, which are practiced differently in each conservancy, by incorporating best practices and lessons from the organization’s Herding for Health program in southern Africa.

    © Will Turner

    An elephant herd stares down a pack of hyenas.

    For landowners like Dickson Kaelo, who was among the pioneers to propose the conservancy model in Kenya, the return of cattle to the ecosystem has restored a natural order.

    “I always wanted to understand how it was that there was so much more wildlife in the conservancies than in Maasai Mara National Reserve,” said Kaelo, who heads the Kenya Wildlife Conservancy Association, based in Nairobi.

    “I went to the communities and asked them this question. They told me savannas were created by elephants, fire and Maasai and cattle, and excluding any one of those is not good for the health of the system. So, I believe in the conservancies — I know that every single month, people go to the bank and they have some money, they haven't lost their culture because they still are cattle keepers, and the land is much healthier, with more grass, more wildlife, and the trees have not been cut.

    “For me, it’s something really beautiful.”

    Further reading:

    Will McCarry is the content director at Conservation International. Want to read more stories like this? Sign up for email updates. Also, please consider supporting our critical work.

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