The Effectiveness of Tetrastichus kodaikanalensis Saraswat on Population of Microterys ericeri Ishii

The survival rate and oviposition number of Tetrastichus kodaikanalensis Saraswat are influenced by temperature noticeably.The generation survival rate is 1.84%,31.83%,80.39%,72.75%,48.08% and 22.81% at 18,21,24,27,30 and 33 ℃ respectively.They have the most oviposition number with the highest oviposition percentage at 30 ℃ (mean 13.21 ova with 84.84%),and the shortest oviposition days at 33 ℃ (mean 5.43 days).There are three peaks for the adults of T.kodaikanalensis in male white wax insect:the last ten days of June,the first-second ten days of August,and the second-last ten days of September.There are also three peaks in female white wax insect:the first-second ten days of August,the second-last ten days of September,and the last ten days of October-the first ten days of November.They have the most population number and the highest hyperparasitization on M.ericeri at the third peak.It is 47.78% and 54.66% respectively to the third and fourth generation hyperparasitization of T.kodaikanalensis on M.ericeri which is parasitized in female white wax insect,and 56.66% and 64.71% respectively in male white wax insect.It is 76.00% to the hyperparasitization of the fifth generation.The hyperparasitization of T.kodaikanalensis on M.ericeri is the fourth instar larvae>the fifth instar larvae>pupae.By putting pupae in the field,T.kodaikanalensis can control the population density of M.ericeri and increase the production of white wax and ovisac remarkably.Putting 30 pupae per host tree,the production of white wax is the control (36.4 g),once (111.3 g),twice (137.6 g);the production of ovisac is the control (82.1 g),once (149.8 g),twice (219.7 g).