Here in Israel our spraying problems start with those that are carried out while the citrus groves are flowering, (primarily in March) . Maximum efforts are made to alert the growers to the restrictions on spraying (insecticides that may and should not be used, acceptable methods of aplication --ground sprayers as opposed to plane spraying and night time application in preference to day time).
In spite of all the information out there, the grove owners still prefer to do what is easiest for them and the bees suffer.