A comparative study on Chrysoperla carnea (Steph.)-eggs with and without stalk of a with semisynthetic diet and of a with aphids fed culture with regard to a field application
1993
Sengonca, C. (Bonn Univ. (Germany). Inst. fuer Pflanzenkrankheiten) | Schimmel, C.
In the present study Chrysoperla carnea (Steph.) (Neuroptera, Chrysopidae)-eggs with and without stalk were compared. The eggs stem from stock breeds either fed with a semisynthetic diet (Bionova breed) or with aphids (Institute breed). The comparison is done with the use of the parameter hatching rate of the larvae and with parameters of the following larval and pupal development. The experiments were conducted in a climatic chamber under defined conditions. The individuums of the egg and the following development stages were each kept in little petri dishes. The results of the experiments exhibit that the hatching rate of those larvae which originate from both variants of the Bionova breed, where the eggs were separated from the stalk, was clearly lower (60% and 62%) than that one of the other variants (78, 84 and 86%). The larvae, which stem from eggs with stalk maintained at the institute developed within 19,9 days which is significantly longer than the development time of the other variants. The larvae of the same breed but destalked required 16,9 days to reach the pupal stages. The development times of the 3 variants of the Bionova breed were 16.6, 16.1 and 15,8 days respectively. The moratlity rate was highest (50%) for those larvae of the Bionova breed, which stem from eggs without stalk. In contrast to this the mortality of the other variants varied between 25,6 and 35.5%. The duration of the pupal stage for individuals that originate from the Institute breed was significantly longer (16.2 and 16.5 days) than that one for individuals of the Bionova breed (13,5 and 13,8 days). the other variants had no influence on the duration of the pupal stage
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