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tony.z 发表于 2016-5-14 18:40 
除虫菊对蜜蜂有影响吗?
pyrethrum 除虫菊 Toxicity to Bees
Bees are necessary for plants that require pollination to reproduce. Any insecticides that kill bees in your landscape may also affect your plants. Pyrethrum is categorized as level three in terms of its toxicity to bees. This means it is moderately toxic and can kill bees. If you are careful in determining the method of application and timing you can avoid harming bees while treating your plants for pests such as aphids, thrips or mites.
Preventing Harm to Bees
To avoid harming the bees in your garden, apply pyrethrum insecticides only in the late evening, night or early morning. During this time bees are not active and are least likely to come in contact with the insecticide. Do not apply pesticides to blooming plants on nights when dew is forecast or when temperatures are expected to be below 60 degrees Fahrenheit. In these conditions, the residual effects of the insecticide are typically twice as hazardous to bees. Liquid formulations of pyrethrum insecticides are usually less hazardous to bees than dusts or granular forms, and they won’t stick to bees’ hairs. Pyrethrum dusts can be carried on the bees’ hairs back to the hive, where the insecticides may affect the queen.
http://motherhood.modernmom.com/pyrethrum-kill-bees-10318.html
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