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Biological studies on Monorthochaeta nigra Blood & Kryger (Hym., Trichogrammatidae) as egg parasitoid on the tortoise beetle, Cassida vittata Vill. (Col., Chrysomelidae)
Author(s) -
Awadalla S. S.
Publication year - 1996
Publication title -
journal of applied entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.795
H-Index - 60
eISSN - 1439-0418
pISSN - 0931-2048
DOI - 10.1111/j.1439-0418.1996.tb01618.x
Subject(s) - biology , parasitism , parasitoid , trichogrammatidae , zoology , longevity , fecundity , botany , biological pest control , host (biology) , ecology , population , demography , sociology , genetics
Laboratory experiments were carried out to study the relationship between the egg parasitoid, Monorthochaeta nigra , and its host, Cassida vittata . The results indicated that the number of eggs deposited per female and the percentage of parasitism decreased as host egg density increased. When the parasitoids were reared under laboratory conditions, the results obtained indicated that increasing temperature (from 20 to 25 then to 30°C) had a negative effect on the oviposition period, post‐oviposition period, adult longevity for males and females, the number of deposited eggs, the percentage of parasitism and the number of emerged parasitoids or successful parasitism. However, the longest oviposition period (4.4 ± 0.9 days), post‐oviposition period (5.8 ± 1.5 days), and longevity (9.2 ± 0.9 and 10.0 ± 1.9 days for males and females, respectively), the highest number of deposited eggs (76.0 ± 14.1 egg/female), and the highest number of emerged parasitoids or the successful parasitism (67.6 ± 11.1/female or 89%) were recorded for parasitoids reared under the lowest tested temperature (20°C).