Control in vegetable crops during bloom
Healthy bee populations are an essential element to many vegetable
operations. Honey bees provide pollination services or they may
enter other fields looking for an alternate source of pollen or
water. As honey bees forage over a wide area, on average 2 miles
from the hive location, many honey bee colonies may be impacted
by the use of pesticides.
In a perfect world, all spraying would stop when vegetable crops
come into bloom. Unfortunately, most insect pests do not stop feeding
just because there are blossoms in the field.
Many insecticide labels have specific wording pertaining to applications
during bloom. Most insecticides are grouped into three categories;
do not use on flowering crops or weeds, do not apply to flowering
crops or weeds if bees are visiting the treated area, and avoid
spraying when bees are foraging. Always consult the product label
before applying any crop protection product. Remember the label
is the law.
Do not use during crop or weed flowering period: Lorsban
15G, Lorsban 50W, Movento, Nufos, Pyrinex, Pyrifos
Do not apply to flowering crops or weeds if bees are visiting
the treated area: Actara, Admire, Alias, Assail, Concept, Cygon,
Delegate, Diazinon, Entrust, Grapple, Imidan, Lagon, Lannate, Lorsban
4E, Malathion, Matador, Orthene, Silencer, Success, Thiodan/Thionex
Avoid spraying when bees are foraging: Ambush, Decis, Dibrom,
Lorsban 4E, Monitor, Pounce, Perm-Up, Rimon, Ripcord, Sevin XLR
Best Management Practices to Prevent Bee Poisoning
- Apply insecticides after 8 pm when the bees are not foraging.
A second option is apply before 7 am. However, due to the residual
activity of most insecticides early morning is much less effective
at minimizing honey bee poisoning than evening spraying.
- Do not allow insecticides to drift onto flowering crops or potential
bee habitat, this can include nearby flowering plants.
- Wherever possible, select the least toxic insecticide and/or
formulation for the job. Consult Table
11-3. Relative Toxicity of Pesticides to Honeybees in Publication
360, OMAFRA Fruit Production Recommendations.
- WP formulations are more toxic than EC formulations.
- Consider advising local beekeepers of insecticide applications
so that they may take additional precautions to protect the bees.
Contact the Provincial Apiarist at 1-888-466-2372 x 63595 or the
Apiary Inspector for information on beekeepers in your area.