Studies On Artificial Diets Of Campylomma Chinensis And Their Impact In Field Releasing

Campyloma chinensis Schuh (Hemiptera: Miridae) is a kind of natural enemy for serious pests in longan. It was first found in Fujian province China, in 1984.C. chinensis Schuh can prey on eggs of Conopomorpha sinesis Bradley, nymphs and eggs of Cornegenapsylla sinicaYang et Li, nymphs and eggs of Diaphorina citri Kuwayama and Pseudophacopleron canarium. It is valuable to control pests of fruit tree.This study include: 1) artificial diet. 2) effect of releasing the bugs in field.The effects of 17 kinds of diets on the development and reproduction of C. chinensis Schuh were studied. Fed on diet SI, diet S2, diet S3, diet S4, diet Cl, diet C2, diet C3, diet C4, diet C5, diet C6, diet C7, diet C8 and diet C9, the bugs couldn' t complete their nymphal stage. The bugs could complete their nymphal stage on four kinds of diets, diet CIO, diet Cll, diet S5, and diet S6. The rates of survival were 54.29%, 81.11%, 91.67% and 88.89%, respectively.Adults emerged from nymphs bred on diet Cll could not oviposite. Their longevity was very short and significantly different from that of adults fed on natural preys. The first generation adults emerged from nymphs on diet CIO, diet S5, diet S6 could oviposite, the mean oviposition is 26.87, 24.20, 18.71, respectively.According to the survival rate and oviposition, the diet S5 and diet S6 were selected to rear more generations for further research The effect of two kinds of artificial diets on survival rate, preoviposition period, longevity of adults, fecundity and sex ratio were studied. The result of rearing on diet S6 showed that the nymphal period of the third generation had little difference from that of the first generation. The male longevity of the third generation was not different from that of the first generation. The preoviposition period was extended, the longevity of females was shortened and the number of eggs produced by per female decreased in third generation. The three parameters of the third generation were significantly different from ones of the first generation. The survival rate of the third generation fell, too. The result of rearing on diet S5 showed that all of the biological parameters were not significantly different between the first generation and the third generation. Compared with the first generation, the nymphal period and preoviposition period of the seventh generation was extended; longevity of male and female were shortened. These parameter had significant difference between the two generations. Compared with the first generation and the third generation, respectively, the fecundity decreased in the seventh generation. After rearing more generations on diet S5 or diet S6, the phenomena of degeneration appeared, such as extension of preoviposition and decrease of fecundity. Compared the diet S5 with diet S6, diet S5 had less negative effect on the offspring of C. chinensis Schuh.The method of GB7649-87 was used to analyze the content of amino acids in eggs of Diaphorina ci tri Kuwayama, in diets S5 and in dietS6. The result showed that, among the three samples the occupancy ratio of each kind of amino acid on total amino acids was similar to other samples. The distributed pattern of each kind of amino acid may be critical for insect.The study of releasing in long an orchard to control the Cornegenapsylla sinica Yang et Li and Conopomorpha sinesis Bradley showed that C. chinensis Schuh could cause high corrected reducing rate of Cornegenapsylla. sinica Yang et Li, and could significantly decrease the number of survival eggs of Conopomorpha sinesi s Bradley after released six days.Based on the study, C. chinensis Schuh was regard as an effective natrual enemy to control Cornegenapsylla sinica Yang et Li and Conopomorpha sinesis Bradley.