Question

RNAI is used to control pest on which plant

Answer 1

RNAi is to control insects by transgenic plants. Most of the current transgenic crops with specific control against insect pests 
Hope it was helpful

Answer 2

RNAI is a method to protect the plants. These only protects transgenic plants and helps them not to get affected by the pest. It is highly useful and is used very commonly and widely.

RNAI are the special kind of pesticides which help the helps to stay pests free and safe. This is the answer of the question.

RNA interference (RNAi) is a biological process in which RNA molecules inhibit gene expression or translation, by neutralizing targeted mRNA molecules.

Historically, RNAi was known by other names, including co-suppression, post-transcriptional gene silencing (PTGS), and quelling.