Bees for Development Journal 106
PESTICIDES KILL BEES IN ETHIOPIA
Janet Lowore, Bees for Development,1 Agincourt Street, Monmouth, NP25 3DZ, UK PHOTO © BfD
Keywords: Lathyrus sativa, Malathion, organophosphorus insecticide Farmers Tewebe Nigru and Muluken Anteneh live on a smallholding in the hills overlooking the expanse of the Andassa plain in northern Ethiopia. In addition to crops and cattle, like many Ethiopian farmers they are also beekeepers. Tewebe learnt beekeeping from his father and has kept bees all his life and says: “In the past I had many more colonies but due to deforestation and lack of bee forage the number has reduced. These days bees are dying also from poisons”. When the main growing season ends, to shore up food supplies, many farmers plant grass pea Lathyrus sativa as it grows well in the dry season, benefiting from residual moisture in the soil. However, possibly because it is one of the few plants to flower at this time of year, it is attractive to both honey bees and insect pests. Farmers intentionally apply insecticides to tackle the pests, and unintentionally kill honey bees at the same time. The pest incidence associated with Lathyrus sativa used not to be so severe but - with intensification of planting – so has followed intensification of pest attack. Farmers habitually spray the flowering crop with Malathion. Tewebe explained that he understands that it is this pesticide that is affecting his bees because he detects that the colonies dwindle during this period and he observes dead bees in the fields.
Tewebe Nigru and Muluken Anteneh
Malathion
GENERAL ADVICE TO AVOID PESTICIDE POISONING • Choose pesticides which are not the most toxic • Apply pesticides before the crop is in flower • Apply pesticides at night, when honey bees are not foraging • Beekeepers can temporarily confine their bees to the hives by closing the entrances – but this can only be done for a short time and where there is no risk of the colony overheating
Malathion is an organophosphorus, synthetic insecticide used widely in agriculture and also to kill insects to protect public health. This pesticide is categorised as highly toxic to honey bees. The Pacific Northwest Extension Publication How to reduce bee poisoning from pesticides1 states that it should never be applied to flowering crops and has a 2-5 day residual toxic effect. The Apiculture Programme of North Carolina State University states2 Malathion to be “highly toxic” and that “severe bee losses may be expected” when used in the vicinity of honey bees. 1 2
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www.cru.cahe.wsu.edu/cepublications/pnw0518/pnw0518.pdf www.cals.ncsu.edu/entomology/apiculture/pdfs/2.12%20copy.pdf
too difficult to move the hives away, the bees can be confined inside the hives. The hives can be covered by large burlap sacks. It is necessary to put water on the sacks to cool the bees. The bees should also be provided with water inside the hives, so that they are able to cool the brood. If the hives are placed in shade, and the sacking is kept wet, the bees can be covered for up to two days. • It may be necessary to apply water to the sacking every 1-3 hours to keep the colony sufficiently cool - overheating of a colony can lead to rapid death. Larger colonies are more sensitive to overheating than small, and it is important that there is plenty of space and good ventilation in the hive. • If the bees are near a water pipe it can be possible to keep them inside their hive by constantly sprinkling them, so that they believe it is a rainy day. * available at www.beesfordevelopment.org/portal
In BfDJ 34 (March 1995) we published our first full colour centre fold Bees and Pesticides written by Ole Hertz*. The article offered suggestions for protecting bees against pesticides which are still pertinent today. How to protect bees against pesticides Beekeepers can help reduce bee poisoning in different ways: • Bees can be kept at a distance safe from areas where pesticides are being applied. This must be at least 7 km, although the farmer will not get crops pollinated. • The beekeeper and the farmer can co-operate. If beekeepers learn about different pesticides, they can discuss with farmers, warn them against the most dangerous pesticides and develop beneficial agreements concerning pollination services and the prudent use of pesticides. • Bees can be moved away before the spraying and kept away as long as the poisons are still in the flowers. • If pesticides are used on flowering plants near hives, and it is
Bees for Development 14
20 1993
YEARS 2013
