Bionomics of the Purslane Sawfly, Schizocerella pilicornis1

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Abstract
The purslane sawfly (Schizocerella pilicornis Holmgren) is a leaf miner and external feeder that may control common purslane (Portulaca oleracea L.). The larvae feed for approximately 6 days and undergo 5 developmental stages. The mature larvae burrow into the soil to a depth of 3.5 cm to pupate. The adults emerge about 7 days later, live approximately 24 h and do not feed. Unfertilized females produce only males wereas fertilized females produce progeny in a ratio of 5 ♀ to 2 ♂. A female will oviposit up to 40 eggs in a 4-h period and will lay only one egg/leaf. If leaf material is limiting, however, she will oviposit up to 4 eggs/leaf.

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