Controlling Techniques of Common Pests in Lotus Roots

2022-10-27 07:04:27

1. Golden rootworm. The rootworm is also known as the rice root leaf beetle, the adult has the elytra, and the larvae have the shape of the larvae, known as the mantle or otters. The larvae sneaked into the mud and sucked juice near the nodes of the underground stems. After entering the pod stage, they were damaged near the nodes of the whole body. As a result, the upper leaves of the larvae were small and yellow and the growth potential declined; The formation of insect spots on the larvae reduces the yield and quality.

Control methods: 1 weeding weeds in Putian, especially the eye dish (commonly known as comfrey), to reduce adult spawning sites; 2 combined with planting, 50% of carbaryl wettable powder per 667 square meters 1.5 ~ 2kg, add 10kg dry fine soil, evenly spread into the paddy field after the leveling, or use Miduer 1.5kg or phoxim granules 3kg mixed into the mud to kill the soil larvae; 3 when plowing the whole field, every 667 square meters Mi Shi into the fresh lime of 75 ~ 100kg, tea dry 40 ~ 50kg or rapeseed cake 50 ~ 100kg; 4 food root larvae of winter worms in the underwater winter mud, in the winter draining fields of water winter plough frozen wolfberry can be killed The dead part of the overwintering larvae; 5 early damage, combined with top dressing every 667 square meters mix Midol 1.5kg or phoxim granules 3kg, can also mix the medicine into 20kg fine soil evenly into the paddy fields; every 667 square meters of application 20% chlorpyrifos 200g plus lime 100kg, can kill 80% to 90% of the larvae; the summer adult worms when the dew is not dry every time 667 square meters of Dicedia powder 2.5kg.

2. Locusts. Mostly migrated from winged locusts on dry field crops. From the beginning of May to the end of October, it can be harmed on lotus root plants, with the most serious damage in June. Adults and nymphs clustered on the backs of leaf buds, buds, and new leaves to suck juice, causing leaf shrinkage, curling, plant growth decline, and reduced yield and quality.

Prevention: In the early days of development, use 1 part of 40% dimethoate emulsion, add 1 part of vinegar, add a small amount of detergent as an adhesive, mix 1000 times with water, spray, or use 50% anti-inflamy WP to add water 1000 Times spray. When spraying, strive to achieve uniform and thorough.

3. Spodoptera litura. The worm is an fulminant pest. Dietary miscellaneous, adults are larger moths, forewing auburn, in two gray broad band-like twill, hind wings white, larvae larger, old mature body up to 3cm, dark brown head, back section new Dark spots. Many generations can occur in a year, and the mature larvae spend their winters in the soil. The larvae devoured lotus leaves in June-August, and in drought-prone years, they often broke out in July-September and ate the lotus leaves, leaving only the main veins.

Prevention and control: In summer, dry and rainy days, field inspections shall be strengthened. If young larvae are found, they shall be sprayed and prevented immediately, and the larvae shall be sprayed before the third instar, that is, if the length of the body does not exceed 1 cm. When nymphs are above 3 years of age, the drug resistance is increased and it is difficult to control them. The control of young larvae generally can be used 2.5% deltamethrin 2000 times, 20% cypermethrin 2000 ~ 2500 times, biological pesticide BT emulsion 500 times or 1000 times dichlorvos emulsion plus a small amount of detergent spray. For individual mature larvae, artificial killing is used.

When sprayed on a large area, it is not easy to spray evenly, and there is a phenomenon of heavy spraying or missing spray. Therefore, moth traps can be trapped at the Tanabe point, or pesticides aerosol generators can be used to smoke with the original drugs such as dichlorvos, trichlorfon, deltamethrin, and dimethoate. The effective range is up to 100 meters, saving labor and labor. The effect is good.