Seasonal prevalence and effect of temperature on the development of Ponticulothrips diospyrosi Haga et Okajima [Thysanoptera]
1990
Uchiyama, K. (Okayama Univ., Kurashiki (Japan). Research Inst. for Bioresources) | Kawada, K.
Occurrence and abundance of Ponticulothrips diospyosi were studied in 1986 at Okayama City. The eggs were deposited by overwintered adults on the persimmon leaves in the first week of May. Then the larvae appeared in the forth week of May, pupae in the first week of June and new adults in the third week of June. The population increased rapidly until the first week of June, but decreased in the next weed. On July 10 the galling leaves fell to the ground and new adults were dispersed. The relation between temperature and velocity of development was linear between 15 and 25 degrees C. The theoretical development zero and the effective cumulative temperature for development were 10.5 degrees C and 68 day-degrees for the egg period, 10.8 degrees C and 134 day-degrees for the larval period and 11. degrees C and 79 day-degrees for the pupal period
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