Scientific name Scrobippalioliopa (10wer) Lepidoptera, Gacidae. Alias ​​tobacco moth, tobacco lean moth, tobacco moth. Located in the area south of the Yangtze River. The host has safflower tobacco, sweet tobacco, and leaf tobacco. Injury features invade the young stems of early tobacco seedlings to form worms, resulting in slow growth of tobacco plants, leaf hypertrophy, shrinkage or curling, leaf blade wilting at the base of the petiole, victimization of lateral buds also forms worms, and a few larvae feed on the phloem. Morphological characteristics Adult body length 5.5-7mm, wingspan 13-13.5mm, earthy yellow, dark brown scales scattered in the front wings, slightly shiny silver, 5th diameter veins from the 1/4 of the 4th diameter; Gray-brown, trapezoidal. The clumps at the end of the female moth are arranged neatly. Eggs are oval in shape and wrinkled on the surface. The last instar larvae are 10-13mm in length, yellowish-white, slightly enlarged on the chest, and have more body folds. 5-8mm long, spindle-shaped, brown. Life habits Guizhou and Yunnan are born four generations ago. The larvae and cockroaches are overwintering in the stems and stalks, overlapping from generation to generation. In April of the following year, when wintering adults became eclosion, it was time for early tobacco transplanting. The first generation of larvae occurred between May and June and invaded young shoots of early tobacco seedlings. Larvae 33-59 days. The second-generation larvae occur in late June-August and are mainly responsible for late smoke. The second-generation larvae are 19-42 days old. Three generations of larvae occur from August to September, and larvae range from 23 to 56 days. Four-generation larvae occur after September and larval stages are 98-123 days. Adults are hidden under tobacco and weeds during the day and they are active at night. They like to lay eggs at the axillary buds of low-level tobacco plants. Each female produces more than 70 eggs, and the oviposition period lasts 3 to 5 days. Before the mature larvae larvae, the larvae bite the feather hole outwards, leaving a thin film on the outer surface of the pest, and knotting white pupa and phlegm in the gallbladder. Natural enemies Bend-tailed bees, potato tuber moths, etc. Prevention methods (1) Tobacco stems are removed and harvested in time after tobacco harvest. (2) Strengthen the management of tobacco seedlings so that the soil is often kept moist. Care should be taken when removing the insect seedlings when planting. (3) Spray 80% of dichlorvos EC 1000 times at the age of adults.
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