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FIELD INVESTIGATIONS UPON THE CONTROL OF THE MUSTARD BEETLE, PHAEDON COCH‐LEARIAE F., ON WATERCRESS
Author(s) -
EDWARDS E. E.
Publication year - 1938
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.1744-7348.1938.tb04357.x
Subject(s) - pyrethrum , watercress , rotenone , biology , toxicology , population , horticulture , botany , pesticide , agronomy , demography , sociology , mitochondrion , microbiology and biotechnology
S ummary1 An account is given of field experiments in 1935 with pyrethrum and derris preparations for the control of Phaedon cochleariae F. on watercress plants. 2 Average infestations, judging by the beetle population on the untreated plots, were reduced by:( a ) Pyrethrum emulsion of 0.01 % content of pyrethrin I to 37.9 %. ( b ) Derris wash of 0.004 % rotenone content to 22.4%. ( c ) Derris dust of 0.2 % rotenone content to 13.7 %. ( d ) Derris dust of 0.5 % rotenone content to 3.1 %.3 The difficulties involved in the general application of insecticides for the successful control of the beetle in commercial culture of watercress are discussed. 4 A basis for controlling the beetle by means of direct measures is presented in the light of observations on extended trials by watercress growers in 1936 , based upon a consideration of the results obtained from the 1935 field experiments and from a study of the life history of the insect.