Life cycle of a non-diapausing population of the two-spotted spider mite,Tetranychus urticae Koch in a pear orchard |
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Authors: | Akio Takafuji and Mitsuji Kamibayashi |
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Institution: | (1) Entomological Laboratory, College of Agriculture, Kyoto University, 606 Kyoto, Japan;(2) Laboratory of Applied Entomology, College of Agriculture, Okayama University, 700 Okayama, Japan |
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Abstract: | Summary The life cycle of a non-diapausingT. urticae population was studied in a pear orchard in the southern part of Okayama Prefecture, western Honsh?, Japan. The mites overwintered
only on biennial weeds in the orchard without entering diapause, started to increase in number in early spring on them and
then moved to other weeds as they emerged. The occurrence of the mites on pear began in early May several weeks after the
unfolding of pear leaves and the population on pear was initiated by the migrants from the weeds around the base of pear trees.
The population on pear showed two distinct peak occurrences, one in June and the other in mid-autumn. After pear leaves dropped
in late autumn, the mites returned to biennial weeds for overwintering.
This work was supported in part by Grant-in-Aid No. 00556033 from the Ministry of Education, Science and Culture, Japan. |
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