Study on Experimental Population of Cochineal Insect(D.confusus(Cockerell))

A study on the population dynamics of cochineal insect in the lab is carried out by using artificial climate cases The method is to set 8 kinds of combinations of temperature, humidity and light according to orthogonal design and then establish the life tables of the insect The temperature has four levels:15, 20, 25 ℃ and 30 ℃, and the relative humidity has two levels: 60% and 80%, while the light also has two levels: 980 lx and 60 lx Through observations and analysis of several generations, the results indicate that the cochineal insect cannot finish generations under 15 ℃ associated conditions, while at associated conditions of temperatures 20、25、30 ℃, the insect can finish generations, but comparing from the amount of eggs, generation inclination indexes and the sizes of the female adults, 25 ℃ associated conditions are the best The results also indicate that average hatching percentage of egg is about 50 and the survival percentage is probably 70 at 20～30℃, and that the number of females is more than that of the males in the cochineal populations,environmental factors have large effect on the sex ratio of the cochineal insect and the generation inclination index usually surpasses 20 The development starting point temperature of the insect is 90 ℃, and effective accumulated temperature of one generation is 822.9 day degrees The results of multifactor analysis of variance show that temperature is the most remarkable factor to affect development of the insect