. Agricultural plant pest control : a study manual for commercial and governmental pesticide applicators . Weeds; Pests. what stem ma^ot - Mermiyza miericmta This insect is not a major pest in small grains in Montana. In most years a very small percent- age of stems will be infested. Heads of the infested plants turn white "white top " and are easily pulled out of the terns. Crop ro- tation and removal of volunteer grain is helpful in lowering the population of the wheat stem maggot. Wheat stem maggot larva. forming a chamber in which the larvae overwin- ter. Late in May of the follo
. Agricultural plant pest control : a study manual for commercial and governmental pesticide applicators . Weeds; Pests. what stem ma^ot - Mermiyza miericmta This insect is not a major pest in small grains in Montana. In most years a very small percent- age of stems will be infested. Heads of the infested plants turn white "white top " and are easily pulled out of the terns. Crop ro- tation and removal of volunteer grain is helpful in lowering the population of the wheat stem maggot. Wheat stem maggot larva. forming a chamber in which the larvae overwin- ter. Late in May of the following year, pupation occurs, and adults begin emerging about June 10 and are present until about July 15. Egg- laying in the stems begin during this period with hatching taking place a few days after. This in- sect spends most of the year in the larval stage. Only one generation occurs annually. Damage: The damage most distinct is the cut- ting of the wheat stem by the adult sawfly laying her eggs. This causes the lodging and loss of grain in the wheat fields. The feeding of the lar- vae also causes damage to the conductive tis- sues of the plant by their feeding inside the stem. Habitat: The wheat stem sawfly is found in wheat fields and where volunteer wheat is found. They are also found in grasses that serve as al- ternative hosts. what stem sawfly - Cej/his cindib' Life cycle: The adult insect is a small, slen- der-bodied sawfly of black and yellow color. The larva is a slender, yellowish, almost legless cat- erpillar-like worm that tunnels up and down in- side the stems. This weakens the stem enough to reduce the yield of grain or cause loss by stalk breakage. Fully grown larvae attain a length of 10 mm. By late July, the larvae move to the base of the stems and gnaw a ring around each from the inside, weakening the straw which easily breaks off at ground level. Each infested stub is then plugged at the top with frass (in- sect feces) and lined with silk-like material Adult
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