Rice worms are commonly known as borers, and the most common ones are the stem borer and the rice borer, rice borers, and large borers. In addition to damaging rice, the second crop also harms crops such as corn and wheat. The rice stem borer is a single-feed pest that only harms rice.
Damage characteristics
The locusts are divided into four stages: adults, eggs, larvae, and pupae. Only the larval stage can eat rice stems. The larvae of Sinioptera larvae are pale brown, with five purple-brown longitudinal lines on the back; pupa larvae are yellowish-white or yellow-yellow, with a green vertical line in the center of the dorsal aspect.
The rice larvae feed on rice by the larvae and form dry dead seedlings or invaded leaf sheaths at the seedling stage and the tillering stage, causing yellow-brown streaks at the victim's site and forming a "dry sheath". For example, in the booting stage, stems are stalked to form the dry ear; the stem stalks after heading and the spike and stem section are injured form a “white spikeâ€, which impairs the yield; and the formation of “bug-injured strains†results in less damage.
Codling moths are hidden between the tussocks or between grasses during the day and are active at night. They have phototaxis and tend to lay eggs on the green rice plants. During spawning and gestation of rice, more eggs are laid. The newly hatched larvae first colonize the leaf sheaths and form a dry sheath. Afterwards, the stem pods form a dead heart, etc., and the mature larvae defoliate in the rice stems.
Control methods
1. Control of rice borers, we must adopt a second generation of picking and controlling a generation, to prevent the second generation;
2. Before locusts hatch and phlegm, only muddy water is left in the field, so that the ant locust is harmed or reduced. The deep water 13-16 centimeters is rushed after hatching or phlegm peak, which can eliminate a large number of locusts.
3. Chemical control:
Rice leaf roller control in the hatching period of eggs. Lightly occur, with 1.8% abamectin 1.5% per acre or 2.5% abamectin 45 ml, watering 15-30 kg (depending on the growth of rice and the circumstances of the case, increase the amount of water, as appropriate), 15 days after spraying One can: re-emergence (heavy generations), with 1.8% of avermectin 75-100 ml per acre or 2.0% of avermectin 70-100 ml singles, spray once every 10 days.
Rice stem borer and rice stem borer have to be treated as one generation, which can preserve seedlings and depress the population density of the next generation. According to the characteristics of the pesticides, the ants were mastered to control the dry sheathing within 3 days after hatching to the peak of hatching; the insecticides, dry booties and white panicles were used to control insecticides in the hatching peak period of each type of rice field. The selected pharmaceuticals: anti-drying heart, seedlings (1.8% avermectin EC50 ml + 40% aqueous solution of iamifosf EC50 ml) or redemption (2% avermectin EC50 ml + 40% aqueous solution of ampholytic EC50 ml ) Water 30 kg spray; rice heading stage anti-white panicle ? 啵 啵 .. 8% abamectin EC75-100 ml + 40% water-containing phosphorochlorid EC75-100 ml) or redeemer (2% ivermectin EC75-100 ml +40% water-containing phosphorothiocide EC75-100 ml), watered 30 kg spray; rice wax ripening period pest control wounds: use ? 啵 啵 啵?.8% avermectin EC 100 ml +40% water amine sulfur phosphorus. EC100 ml) or against the clear (2% avermectin EC 100 ml + 40% water soluble EC 100 ml), watered 30-45 kg spray.
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