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The role of refuge areas in the phenology of Rhopalosiphum padi in low rainfall cropping areas of South Australia
Author(s) -
BARRO PAUL J. DE.,
MAELZER DEREK A.,
WALLWORK HUGH
Publication year - 1992
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1992.tb03462.x
Subject(s) - alate , aphid , aphididae , biology , rhopalosiphum padi , phenology , perennial plant , agronomy , homoptera , hemiptera , pest analysis , horticulture , botany
Summary Extensive surveys of possible aphid habitats in South Australia indicated that irrigated perennial grass pastures in the Mount Lofty Ranges and Lower Murray Valley were summer refuges for Rhopalosiphum padi (L.) (Hemiptera: Aphididae). Large numbers of aphids build up in these pastures each year during autumn (April and May) with numbers peaking in May. The size of the May peak was related to the number of aphids surviving the summer. The proportions of alates were highest in May and August/September. Both peaks coincided with a photoperiod of between 11.2 and 11.5 h, and partial correlations suggested that aphid density, photoperiod and temperature were all significant determinants of alate production.