Host Preference and Mechanism of Tetranychus turkestani (Vgorag＆Nikolski) to Different Cotton Varieties

Objective and MethodThe host preferences of T. turkestani to different cotton varieties in Xinjiang were studied.ResultThe results showed that the host preferences of T. turkestani to eighteen cotton varieties had significant difference. T. turkestani was not attracted evidently by Xinhai 21 but attracted strongly by 297-5, 81-3. On this basis, six varieties were selected for biochemical test, that indicated that there was no significant correlation between host preferences of T. turkestani.ConclusionThe higher the content of leaf wax,cotton phenol and brassis ,the weeker the preference of T. turkestani is;the higher the content of tannin is,the stronger the preference of T.turkestani to the variety is;the higher the chlorophyll content the variety has ,the less injury it suffers.