Author： OATMAN EARL R. PLATNER GARY R. GREANY PATRICK D.
Publisher： Entomological Society of America
ISSN： 1938-2901
Source： Annals of the Entomological Society of America, Vol.62, Iss.6, 1969-11, pp. : 1407-1414
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Abstract
Orgilus lepidus Muesebeck, a solitary, internal, primary parasite of the potato tuberworm, Phthorimaea operculella (Zeller), was studied under insectary conditions of 26.7±1°C and 50±2% RH. The translucent-white,acuminate egg, averaging 0.266×0.057 mm (0–12 hr after deposition), is deposited in the body cavity of the host larva where the larvae develop. There are three instars, the first being mandibulate and the other two hymenopteriform. Mature larvae emerged from the host larvae after the latter had spun cocoons, spinning their own cocoons inside those of the host. The total developmental time from egg to adult was about 19 days: egg, 1–2 days ; 1st instar, 5 days; 2nd and 3rd instars and prepupa, 1 day each; and pupa, 9 days. Adult emergence was stimulated by light, and copulation took place soon after emergence of either sex. Males mated more than once, females only 1 time. Unmated females produced malesonly, mated females both males and females. The preoviposition period, if one exists, is less than 8 hr. Without food and water, adults died within 3–5 days; withboth honey and water, females lived an average 21.4 days and males, 23.9 days. Ten mated females had an average ovipositional period of 15.7 days (maximum 22) and produced an average of 632.2 adult progeny of both sexes (maximum 791). Longevity of the ovipositing females averaged 17.6 days (maximum 24), and the sex ratio ( ♂ : ♀ ) of their progeny averaged 1.4. Average production of progeny remained above 40 per day through the first 10 days of the female's life, reaching a peak of 69.2 progeny per day on the 3rd day.
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