Abstract: Based on the indoor rearing methods of adult and larvae， the effects of different foods on the survival rate and the duration of the first and second instar larvae of Holotrichia parallela were determined. The results showed that the survival rates of the first and second instar larvae were significantly affected by different foods. The survival rates of the first and second instar larvae when they were fed with peanut roots were the highest， and it was lower when they were fed with cotton roots， peanut pieces and millet roots. When the first instar larvae was fed with potatoes， the development speed was fast and the concentration was high， while the larvae fed with cotton roots grew slowest and lasted the longest. The second instar larvae fed with potato， sweet potato and peanut roots developed faster， while the second instar larvae fed with cotton and millet roots developed slower and lasted longer. On the basis of this study， by adjusting the field layout and planting structure， the development duration of the larvae， the mortality rate， the population number and the harm to peanuts could be prolonged.

Key words: Holotrichia parallela, food, period, survival rate