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- W2364673546 abstract "The life history of the pine caterpillar, Dendrolimus punctatus Walker, in Hunan Provincewas recently reported by the authors [3]. Different conditions of injury of the host plant,Pinus massoniana Lamb., are considered as closely related to the density of the pine caterpillars.The following works were undertaken and accomplished during 1956 in Hunan Province. Pupae were collected from the host plants which were apparently damaged in different scales.Percentage of females, body weight and body length of pupae were examined. Number of eggslaid by adults was counted, wing expance and body length were also measured. The followingresults were obtained from the above observations. 1. The development of the pine caterpillars rearing under different damaged scales of thehost plant are different: the less the injury of plant, the heavier the pupae, the higher percentageof females, and the more eggs laid by adults; on the contrary, the heavier the injury of plant, thelighter the pupae, the lower percentage of females, and the fewer eggs per females. 2. The range of body weight and the body weight of pupae of the overwintering generationare larger and heavier than that of the first generation. However, number of eggs of the firstgeneration is larger than that of the overwintering generation altho the pupal body weight was thesame. Th number of egg is directly proportionated with the body weight of the pupa and aformula has been derived for calculating the relation between the body weight of pupa and thenumber of eggs. An experiment was undertaken that in ceasing to feed the nearly matured caterpillars of theoverwintering generation in different scheduled times, we have obtained the following results:the earlier in stopping of food comes the higher mortality except those caterpillars have passedlast molt. The percentage of females and the body weight of pupae are also decreased. According to our field observations, the pine caterpillars produce two or three generationsa year which is related closely with the injuring conditions of the host plants. The third gene-ration larvae occur more on the healthy trees." @default.
- W2364673546 created "2016-06-24" @default.
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- W2364673546 date "1958-01-01" @default.
- W2364673546 modified "2023-09-23" @default.
- W2364673546 title "PRELIMINARY STUDY ON THE DEVELOPMENT OF THE PINE CATERPILLAR, DENDROLIMUS PUNCTATUS WALKER,UNDER DIFFERENT CONDITIONS OF INJURY OF THE HOST PLANT" @default.
- W2364673546 hasPublicationYear "1958" @default.
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