These photos describe the biology for Hibiscus mealybugs infected grapevines trees in dry hot regions (south valley, Toshka project, Egypt).this is the first year with infection; we had 5 generations until now and we don't have soil infection; just on Trunk and canes and also bunches, as follow:
1st in February at bud break stage, you couldn't see mummies in this generation unless you spray strong or systemic insecticides, the population growing not very quickly.
2nd in blooming stage migrate to bunches, grows quickly, continue at harvesting time, a lot of crawlers and nymphs.
3rd post harvest, keep in mind that we stop to control at harvest time in our region for one month, you couldn't see a lot of mummies in this generation unless you spray strong or systemic insecticides, a lot of crawlers.
4th generation in September, a lot of mummies in the end of this generation also with a lot of dying females without egg-sac and the insect stop completely without spray for one month.
5th generation, in October but the population not high, with winter sprinklers i expect that every thing will stop soon to come back again in February. so, we'll start to control at dormancy stage as follow:
1 - spray every thing with Mionaze oil in before dormancy [Early not late], (September in our region).
2 - remove the park completely on heavy infected vines then paint them with lime + copper.
3 - after bud break at 10 cm stage, chemigation with Amidor 20%SL (imidaclopride) 2 liters per acre for every thing.
4 - When start bloom, apply Applaude (Buprofezine) 100 ml/ 100 Liters of water.
5 at berry set apply another Applaude (Buprofezine) 100 ml/ 100 Liters of water.
That's all for next year.