Development and Reproduction Comparison of Six-spotted Spide Mite Eotetranychus sexmaculatus(Riley) Feeding on Resistant and Susceptible Rubber Germplasm
The development and the reproduction parameters of six-spotted spider mite feeding on different rubber germplasms were investigated at(28±1)℃,(75±5)% RH, and a photoperiod of 14(L) ∶ 10(D) in the laboratory. The results showed that, the resistant and the sensitive rubber germplasm had significant effect on the developmental duration, fecundity, egg hatching, offspring sex ratio and adult mites lifespan of six-spotted spider mite. The resistant rubber germplasm inhibited significantly the development and reproduction of six-spotted spider mite.After feeding on the resistant rubber germplasm IRCI12, the six-spotted spider mite could not complete their development and reproduction, the adult mites could only survive 7.40 days, and the survival rate was only 6.80%.The average fecundity was only 4.90 eggs, but the eggs could not hatch. In compared to the mites feeding on sensitive germplasm, the RRII103, RRII105, IAN2887, IAN2904 and Guiyan77-11-23(P), the development duration of the six-spotted spider mite feeding on the resistant germplasm, the Reyan87-6-5, IAN717, RRIM600 and RRIC52,was significantly prolonged, and the fecundity, the offspring hatchability, the female percentage and the adult lifespan were significantly decreased. These results provide the theoretic basis for the mechanism study of rubber variety to resistant the spider mites, and the mining and innovative use of rubber tree germplasm to resistant the spider mites, as well as the leading role playing of rubber germplasm in the spider mites management.