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- W2936683713 abstract "1 The investigations were planned to ascertain the extent of the migrations of Winged aphides, their ability to detect individual plants, the development of aphis population following colonization, and the extent to which Virus diseases may be transmitted to isolated plants by winged aphides. 2 Plants were isolated in root crops on seven farms and at varying distances from probable sources of virus infection. Four farms were located in districts where aphis population is usually high and viruses spread very rapidly; two in districts where both aphides and spread of viruses are minimal, whilst one farm could be regarded as intermediate in both respects. 3 Evidence is submitted to show that winged aphides have no difficulty in detecting and colonizing isolated plants. Their numbers were large at the four eastern centres and very small at the three western centres. In all cases the aphis population on isolated plants was less than that of the nearest general crop and suffered more from predators and parasites. 4 It is shown that isolated plants can be reached by migrants from a distance of at least a quarter of a mile, and probably much further. Additional evidence is given that these initial migrants introduce little virus infection to potato crops from extraneous sources. The importance, however, of the later movements of winged aphides, whether initial migrants or those subsequently produced on potatoes, in spreading Viruses from crop to crop, is emphasized. 5 The practical aspects of protecting potato stocks is discussed under conditions of (a) heavy infestation by winged aphides and proximity of partially diseased crops; (b) minimal winged aphis infeatation where numerous sources of virus infection occur in neighbouring crops; and (c) where both aphis infestation and sources of infection are minimal. It is considered that regulations for the improvement of health in seed-potato stocks should take cognisance of these various possibilities." @default.
- W2936683713 created "2019-04-25" @default.
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- W2936683713 date "1938-02-01" @default.
- W2936683713 modified "2023-10-14" @default.
- W2936683713 title "STUDIES ON APHIDES INFESTING THE POTATO CROP." @default.
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- W2936683713 doi "https://doi.org/10.1111/j.1744-7348.1938.tb04353.x" @default.
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