Use of Aphelinus semiflavus Howard for Control of Aphids in a Greenhouse

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Abstract
In planning control programs for the apple maggot, fairly precise information on the emergence and movements of the adult is required. Generally records of emergence are obtained by the use of cages which trap the flies as they emerge from the soil. Bait lures have also been used and Neilson (1960) and others have described their methods. The construction of the cages, their establishment within the orchard. and their careful examination each day for removal of flies is time consuming. The hanging of pans within apple trees containing liquid bait lures is also troublesome and time consuming. The lures require frequent replenishing and become diluted in rainy weather and evaporate in fine weather. Searching for maggot adults in the bottom of thc pans among other fauna is time consuming.

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