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The economics of reduced‐rate insecticide applications to control aphids in winter wheat
Author(s) -
MANN B. P.,
WRATTEN S. D.,
POEHLING M.,
BORGEMEISTER C.
Publication year - 1991
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.1744-7348.1991.tb04885.x
Subject(s) - pirimicarb , biology , aphid , toxicology , agronomy , hectare , aphididae , crop , fenvalerate , winter wheat , pesticide , dose , horticulture , agriculture , homoptera , pest analysis , ecology , pharmacology
Summary Applications of pirimicarb and fenvalerate at full‐rate and at a range of reduced dosages were applied on fields of winter wheat between 1983 and 1988 in West Germany. The relative effects of these treatments on the control of cereal aphids varied according to the growth stage at which spraying took place and the size of the aphid populations. The economic profitability of these treatments depended on the extent of post‐treatment recovery of the aphid populations, the cost of control and the crop value. Under certain circumstances the high efficiencies of commonly‐used insecticides at full dose‐rate are not necessary to gain effective aphid control economically; a better return can be made by reducing the quantity of active ingredient per hectare.