若虫

èr líng ruò chóng jǐn zài liù yuè shàng xún huì chū xiàn míng xiǎn de gāo fēng qī

二龄若虫仅在六月上旬会出现明显的高峰期。

Second instar nymph only occurred a obviously amount peak in early June.

ruò chóng qī yī bān shì shí qī tiān tuō pí sì cì

若虫期一般是十七天，脱皮四次。

The nymph stage is usually 17 days with 4 moults.