Abstract
The effects of larval and pupal allatectomies on egg production by the female gypsy moth, Lymantria dispar (L.), are compared. Correlation analysis showed that the weight of an egg mass reflects the egg number in it. On the average, allatectomies performed on female 6th instars caused an 89% reduction in wet weight of egg masses subsequently laid. Similar surgeries performed on prepupae and early pupae caused insignificant reduction in the weight of egg masses. Allatal reimplantation into a 6th instar restored the ability to lay egg masses of normal weight. Since larval allatectomy did not greatly change ovarian wet and dry weights, results suggest that the loss of the corpora allata affects ovulation and oviposition rather than ovarian development.
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