Varroa sensitive hygiene

About: Varroa sensitive hygiene is a research topic. Over the lifetime, 714 publications have been published within this topic receiving 24928 citations. The topic is also known as: VSH.

Effect on honey bees of DDT applied from the air as a spray to lucerne; Notes on lucerne pollination

Abstract: Summary Ten acres of a lucerne crop at Kurow were sprayed from the air with a DDT, emulsion (“Stantox”) at the rate of 2 lb of 100% pp′-DDT in Ii:} gallons of water per acre. Prior to spraying, 23 hives of bees had been established on the crop. The spray was applied early in the morning when there was practically no bee activity, but shortly afterwards conditions were suitable for maximum bee activity. No adverse effect on adult bees or brood was observed. The crop was strongly repellent to bees for a day after spraying. The DDT spray can be used without harming honey bees or bumble bees provided it is applied when they are not on the lucerne. This insecticide is a logical choice for controlling the variety of insects which attack lucerne. Honey bee and bumble bee counts were made on the crop. All bumble bees were B. terrestris which is a more efficient pollinator of lucerne than the honey bee. But, even if allowance is made for this extra efficiency, bee coverage of the crop falls well below that recomme...