Varietal differences of tea plant to the infestation of Tetranychus kanzawai Kishida
2000
Kawai, A. (National Research Inst. of Vegetables, Ornamental Plants and Tea, Ano, Mie (Japan))
The varietal differences of tea plant to the infestation of Tetranychus kanzawai KISHIDA was examined in 1994, 1995 and 1997 using 39 varieties planted in the tea field of NIVOT. Since populations on each varieties reached the peak at the different day, varietal difference in the density at each day did not represent the varietal differences to the infestation. Since there was significant positive correlation between the peak and cumulative densities in each variety (r=0.956, N=39, p0.01), the peak density represents the varietal differences to the infestation. There was the great varietal difference in the infestation. The infestation was the maximum on the variety 'Yabukita', and was also high on the natural crossing varieties of 'Yabukita'. The infestation on Japanese varieties is high, and that on assam hybrid and varieties introduced from China is low. Though significant correlation could not be found between the survival of female adults and the infestation in the field in each variety, there was significant positive correlation between the number of eggs oviposited and the infestation in the field in each variety (r
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