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The relationship between weight of insect, age, hardness and nitrogen content of cabbage leaves and fecundity of the cabbage whitefly, Aleyrodes brassicae Wlk. (Homoptera, Aleyrodidae)
Author(s) -
Iheagwam E. U.
Publication year - 1981
Publication title -
zeitschrift für angewandte entomologie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.795
H-Index - 60
eISSN - 1439-0418
pISSN - 0044-2240
DOI - 10.1111/j.1439-0418.1981.tb04489.x
Subject(s) - fecundity , whitefly , biology , horticulture , botany , homoptera , nitrogen , pest analysis , chemistry , population , demography , sociology , organic chemistry
Studies were made in the laboratory on the effects of weight of insect, leaf age, leaf hardness (penetrability), and nitrogen content of leaves of cabbage on the fecundity of the cabbage whitefly, Aleyrodes brassicae. The fecundity of the whitefly was directly proportional to her weight. Fecundity and leaf hardness were inversely related. Leaf age had a profound effect on fecundity, with young leaves inducing the greatest number of eggs, and old leaves the least. Percentage nitrogen was highest in young leaves and lowest in old leaves and thus fecundity generally increased as the nitrogen content of the leaves increased. Analysis of the results revealed that nitrogen was a more important factor than either insect weight or leaf hardness in determining the fecundity of the cabbage whitefly. Zusammenfassung Zur Abhängigkeit von Gewicht und Fekundität der Kohlmottenschildlaus, Aleyrodes brassicae Wlk. (Hom., Aleyrodidae) von Alter, Härte und N‐Gehalt der Kohlblätter Die Fekundität von A. brassicae war dem Körpergewicht direkt und der Blatthärte umgekehrt proportional. Das Blattalter war für die Fekundität von wesentlicher Bedeutung, wobei junge Blätter zur größten, alte zur kleinsten Eizahl führten. Der N‐Gehalt war in jungen Blättern höher als in älteren. Die Eizahl nahm mit steigendem N‐Gehalt zu. Insgesamt betrachtet, bildete der N‐Gehalt den wichtigeren Faktor für die Fekundität von A. brassicae.