DAMSEL BUGS Hemiptera: Nabidae Nabis Alternatus, N

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DAMSEL BUGS Hemiptera: Nabidae Nabis Alternatus, N Modified from Ralph E. Berry. 1998©. Insects and Mites of Economic Importance in the Northwest. 2nd Ed. 221 p. DAMSEL BUGS Hemiptera: Nabidae Nabis alternatus, N. americoferus ___________________________________________________________________________ DESCRIPTION Adults are tan or grayish-brown, with piercing- sucking mouthparts and well-developed wings. The membranous portion of the first pair of wings has a number of small cells around the margin. The front pair of legs is modified for grasping their prey. They have slender bodies, and are about 4 to 12 mm long. Nymphs resemble adults, except they are smaller and have no wings. LIFE HISTORY Western damsel bug adult feeding on lygus Damsel bugs overwinter as adults in protected places around the margins of fields. Adults of the Western damsel bug, N. alternatus, begin emerging in May or early June and N. americolferus begins emerging in late March or early April. Adults begin laying eggs soon after emergence. Eggs are flattened on top and are inserted into soft plant tissue along the stems. Eggs hatch into nymphs, which feed on small insects, mites, or eggs. Early instar nymphs may be found on the soil surface beneath plants and under litter near the stems. N. americolferus has two complete Western Damsel bug nymph generations each year with little overlap between the develoopmental stages. N. alternatus has numerous, overlapping generations during the season. DAMSEL BUG IMPORTANCE ADULTS EGGS, NYMPHS, ADULTS Adults and nymphs feed on many soft-bodied insects, OVERLAPPING GENERATIONS including aphids, spider mites, leafhoppers, small ADULTS caterpillars, and insect eggs including those of the J F M A M J J A S O N D Colorado potato beetle. Adults are swift and Months aggressive and rapidly suck the body contents from their prey. Fifth instar Western damsel bugs may consume two or three late instar lygus bugs per day. Warm weather in the spring encourages these predators to multiply. However, cool, moist springs may allow prey populations, such as aphids, to build- Return to Insect List up before the damsel bug population becomes large enough to provide control..
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