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Density Restriction Effects of reproductive rate of Rice Brown Planthopper Population in Super Rice Yongyou 6

Plant Diseases and Pests 2011年第2期2卷 39-42页

作者：徐森富王会福汪恩国陈伟强浙江省台州科技职业学院浙江黄岩318020 浙江省台州市农科院浙江临海317000 浙江省临海市植保站浙江临海317000

[ Objective ] The paper was to study the density restriction effects of reproductive rate of rice brown planthopper （BPH） population in super indiea and japonica hybrid rice Yongyou 6. [Method] Different amounts of rice brown planthoppor were released to super indiea and japonica hybrid flee Yongyou 6 during fillering, booting and gain filling stage, respectively. The reproductive rate and variation dynamics of rice brown planthoppor in super rice was also investigated and analyzed. [Result] Tillering stage： the population quantity of rice brown planthoppor during booting and gain filling stage gradually increased with the increasing basal amount of its population during tillering stage; when the population density of rice brown planthopper during grain filling stage reached a certain limit （〉 250 head/cluster）, the population density during milking stage showed decrease trend with the increasing of such density; the development of rice brown planthoppor population in super rice Yongyou 6 showed the characteristics of fast in middle and slow in two ends. Booting stage： the development of rice brown planthopper pop- ulation from booting to gain filling stage increased with the increasing basal amount of density, and their correlation during milking stage was not significant; flee brown planthopper population still had high reproduction capacity in the middle and late stage of super rice, which had latent risk on rice yield. Gain filling stage ： when population density of rice brown planthopper 〈 70 head/cluster, the development of it population increased with the increase of basal amount of density, which had great threat to yield. [ Conclusion] The result provided theoretical basis for establishment and improvement of monitoring early warning system, cost-ef- fective control of occurrence and damage of rice brown planthopper, and improvement of the sustained control ability against rice brown planthopper.

关键词： Super indica and japonica hybrid flee Yongyou 6 Rice brown planthopper reproductive rate Variation dynamic

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Effect of age on reproductive attributes of an aphidophagous ladybird, Cheilomenes sexmaculata

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Insect Science 2006年第4期13卷 301-308页

作者： OMKAR SATYENDRA K. SINGH KALPANA SINGH Ladybird Research Laboratory Department of Zoology University of Lucknow Lucknow India

The effect of both male and female age was investigated on certain reproductive attributes, viz. mating incidence, mating duration, fecundity, percent egg viability, ratio of reproductive and non-reproductive periods and reproductive rate, of an aphidophagous ladybird, Cheilomenes sexmaculata （Fabricius）. Females started mating at the age of 8 hours post-emergence （PE） and males at the age of 2 days PE. Mating in the laboratory was a maledominated phenomenon. The mating duration and reproductive rate of 10-day-old females when mated with males of varying ages increased up to the male age of 60 days, and thereafter decreased, whereas, fecundity, egg viability and ratio of reproductive and non-reproductive periods increased up to the male age of 50 days, and thereafter declined. However, when females of varying ages were mated with 10-day-old males, fecundity and reproductive rate increased up to 40 days of female age, respectively, then decreased. The ratio of reproductive and non-reproductive periods increased with increasing age of females. Mating age for optimal reproductive output was 10-50-day-old males and NE to 40-day-old females. reproductive cessation in males was recorded after 50 days PE, whereas in females at the age of 40 days PE. Higher mating durations lead to elevated reproductive rates. Delay in the reproductive phase was positively correlated with longevity. The results of this study may aid mass multiplication of this ladybird by identifying and promoting usage of adults of optimal age, Our results also enhance our understanding of the effect of age on reproductive attributes in ladybirds.

关键词： age Cheilomenes sexmaculata egg viability fecundity ladybird longevity,protogyny reproduction reproductive rate

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Intrinsic advantages of Cheilomenes sexmaculata over two coexisting Coccinella species （Coleoptera：Coccinellidae）

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Insect Science 2005年第3期12卷 179-184页

作者： OMKAR AHMADPERVEZ GEETANJALIMISHRA SHEFALISRIVASTAVA SATYENDRAK.SINGH AVANISHK.GUPTA Ladybird Research Laboratory Department of ZoologyUniversity of LucknowLucknowIndia

Development, survival and reproductive performance of coexisting ladybird species, viz. Cheilomenes sexmaculata, Coccinella septempunctata, and Coccinella transversalis, of the tribe Coccinellini were studied and compared to assess their coexistence and ecological relationships. High values of life history parameters, viz. developmental rate,immature survival, fecundity, egg viability, reproductive rate and conversion of efficiency of ingested food were recorded for C. sexmaculata followed by C. transversalis and *** suggesting that the former has intrinsic advantages over the latter two species. This could possibly counterbalance its disadvantages, like relatively smaller size and weight, thereby making it competitive. The developmental period increased with increase in body size. Exceptionally high fecundity after single mating has been recorded in C. sexmaculata. The egg viability, however, was lower than in both Coccinella species.

关键词： cheilomenes sexmaculata coccinella septempunctata coccinella transversalis size reproductive rate bioconversion efficiency

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