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• W2376620009 abstract "When migration takes place, the cotton aphids. immigrate into cotton fields. This begins ata few, spots of a field. However, due to their high multiplication power the aphids spreadvery rapidly over the field; The modes of immigration and dispersion constitute .an importantpart in studying.the biology of these insects. Meanwhile, it is also significant to the practiceof control and prognosis. This paper deals with the development and dispersion of both wingedand wingless forms, the formation of spots and universal dispersal in eotton fields and therelated factors which influence the uneven distribution of aphids. The winged aphids play an important role in dispersion. However, the wingless form arealso of relative significance to short-distance dispersion. In this paper a brief review on thedevelopment of winged forms is given. It is found that there are four density peaks of theappearance of winged aphids. The first peak represents the high natality of winged forms onthe overwintering hosts which .immigrate into cotton fields. The second peak reveals that theimmigrants multiply in large numbers and spread out. The third peak shows the highestpopulation period in cotton fields. The last peak means only the beginning of emigration andthe flying back of the winged aphids to the overwintering hosts. In connection with the mode of dispersion of eotton aphids, it was found that the aphidinfestation began from some spots and then spread into universality in cotton fields. The formof distribution waa random at first, and then became apparently contagious and negative bi-nomial. Almost every plant is contaminated by aphids in a period of about two to threeweeks. The barriers in cotton fields influence the direction and speed of wind which mainly de-termines the distrbution of cotton aphids. The aerial population of cotton aphids was muchconducted by the changed wind speed and direction, and consequentle it deposits in certainspots of cotton fields. We could hardly find out the role played by ants in the dispersion ofcotton aphids although the ants were oceasionally pieking up some aphids from cotton plantto their nests, as such aphids were found dead. The population density varies with differentcultivation systems, such as the two-crop system with cotton seedlings planted between the rowsof bean or wheat, where the aphid infestation was usually found to be lighter. Based upon the character of dispersion, short-period prognosis and advantageous .sprayingor dusting schedule may be proposed." @default.
• W2376620009 created "2016-06-24" @default.
• W2376620009 creator A5042458010 @default.
• W2376620009 date "1956-01-01" @default.
• W2376620009 modified "2023-09-23" @default.
• W2376620009 title "THE IMMIGRATION AND DISPERSION OF COTTON APHIDS IN COTTON FIELD" @default.
• W2376620009 hasPublicationYear "1956" @default.
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