The rainy season in December prompted the postponement of the release of the genetically-modified Aedes aegypti mosquito in Bentong and Alor Gajah, said Biosafety Department official Dr Mohamed Mohamad Salleh on Wednesday. He denied that the delay had anything to do with protests from 23 local non-governmental organizations who had sent an open letter to the government in December protesting the plan to release of the GM mosquitoes.