Aphides And Virus
Considering all aphid records it is recommended that farmers should sow wheat as soon as convenient, the aphid and virus committee said in a statement issued yesterday. Winged aphid numbers had shown a sharp drop this last week and crops sown from now on would probably escape infection. Aphid numbers were still higher in North Canterbury and Ashburton than in South Canterbury, but had dropped to nil in South Otago and Southland.
Sampling of pastures and crops with insect nets had shown that aphid numbers had been very high in a greenfed crop near Timaru and also on roadside grasses at Darfield and Lincoln College. This work had shown that the aphid colonies were rapidly changing into winged forms and if very mild weather persisted they would continue to cause small flights which could ihfect autumn-sown wheat. Further observations would be made on aphid numbers and flights and if any flights occurred fanners would be advised of the necessity to spray.
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Press, Volume CII, Issue 30146, 1 June 1963, Page 7
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164Aphides And Virus Press, Volume CII, Issue 30146, 1 June 1963, Page 7
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