Effects Of Different Host Plants On The Development And Reproduction Of Phenacoccus Solenopsis Tinsley, A New Invasive Pest Of China

Cotton mealybug (Phenacoccus solenopsis Tinsley) is the major pest invading in our country in recent years. Risk assessment reveals that it’s a potentially dangerous pest of most regions in China. Cotton mealybug a isomnivorous animal, and its host plant reaches200kinds. Many researchs demonstrate that cotton mealybug can impair many kinds of ornamental plants and economic plants servesly, especially cotton.This paper studyed the effects of malvaceae okra, spin flower water spinach, solanaceae tomatoes, til family sesame and the gourd the melon on the growth, developmental and fertility of cotton mealybug. Researches showed that the developmental duration, fertility of Cotton mealybug were diverse on different host plants. And the results were as follows:1. In order to study of the effects of host transition on growth and developmental and fertility of cotton mealybug, malvaceae okra and til family sesame were served as the host plants. The results reavealed that host transition had negative effects on growth and developmental and fertility of cotton mealybug. The second generation cotton mealybug growed faster and it’s developmental duration was shorter. For example, the development duration of the first generation were (5.61±0.12),(5.10±0.23) and (6.75±0.31), but the second generation were (4.66±0.06)(4.07±0.09) and (4.32±0.06) respectively. On the other hand, the survival rate and fertility of the second generantion was hiher than the first generation.2. In order to study of the effects of host transition on growth and developmental and fertility of cotton mealybug, two kinds of tomoto were served as the host plants. The results reavealed that there was still discrepancy in development duration and surivial rate, though cotton mealybug invaded in the same tomoto plant but different cultivars. However, there were no apparent effects.3. In order to study of the effects of host transition on growth and developmental and fertility of cotton mealybug, swamp cabbage, okra, pumpkin, sesame and tomoto were served as the host plants. The results showed that the development duration of cotton mealybug nymph ating tomoto and pumpkin was longer than ating swamp cabbage, okra and sesame. The survival rate of cotton mealybug ating wamp cabbage, okra and sesame was higher than that ating tomoto and pumpkin. The fertility of cotton mealybug ating swamp cabbage was the most powerful, ating tomoto the weakest. The results demonstrated that swamp cabbage was the most suitable for cotton mealybug, and tomoto was insuitable forthem. We also found that1-2instar nymphy of cotton mealybug died easily, and reaching to the third instar, their survival rat was improved.