Some Experiences in Breeding Trichogramma Minutum Riley

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Abstract
An account is given of 2 years experience in breeding Trichogramma minutum Riley, by using Sitotroga cerealella Ol. eggs as the host. Mites which proved a serious menace to the supply of S. cerealella have been controlled by sulphur. Low humidity prevents many S. cerealella larvae from making entrance into the grain. The ratio of reproduction of T. minutum Riley has varied a great deal. The presence of sulphur is a factor in this, but the condition may prevail when sulphur is not used. S. cerealella eggs are somewhat more readily parasitized after being stored in a refrigerator. They have been parasitized successfully after being held for 82 days at a temperature of 38 degrees Fahrenheit.

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