نوع مقاله : مقاله پژوهشی
نویسندگان
1 مر کز تحقیقات کشاورزی و منابع طبیعی استان مازندران
2 اداره کل منابع طبیعی ساری، استان مازندران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
The forests of Mazandaran are the most economically important forests in Iran, comprising many industrial trees such as oak, beech, hornbeam, maple, alder and iron wood. Recently, these valuable trees have been subjected to attack by Ennomos quercinaria (Lep.: Geometridae). Because of severe larval feeding many trees showed early defoliation. In addition to direct damage caused by the larvae on trees in parks, the pest reduces natural beauty of the site by early defoliation and fall down of larval residues.To study the life cycle of the pest, biweekly samples were taken from infested trees at Shahid Zareh Park during 2000-2001. Eggs, larvae and pupae were reared in the laboratory. Adult insects emerged from pupae in April and their population peak occurred in May. Females lay eggs on trunks, branches as well as building walls. Number of eggs in each egg mass varied and the largest number were 280 on trunk of oak. Mean number of eggs was up to 200 by dissecting adult females. Eggs are dark green. This pest hibernates as egg. The overwintered eggs hatch at the beginning of spring. Pupation occurs in the inner fold of the host plant leaves and tree trunks.The pest has one generation per year. Mass trapping of adult insects, using light trap is the best way to keep pest population down.
کلیدواژهها [English]
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