Aphids and rice panicles

Aphids were attacking the rice panicles and I had to do something. Went to the storeroom and there were a few bottles of pesticides. One with permithryin as the active component listed out aphids as susceptibel to its activity. So, took it, diluted in water and sprayed on the plants. It has been raining continously and I was not in the mood to walk all the way to the green house. But, I can't see any aphids after a few hours the pesticide has been sprayed so may be it is working. It is really laborious to take care of the rice plants with the insetcs attacking and I think the plants are under orange leaf disease as well. The green house is in a bad condition thus is suceptible to all kinds of diseases. Hopefully, the panicles are able to bear seeds which will be used to generate the next stage of screening.