Recently, garlic growers have reported that the growth of garlic in the late autumn is abnormal. Some leaves begin to yellow, some are curled, some new leaves are yellow and dead, and some leaves have irregular stalks. I don’t know what it is. The insect is harmful. According to the on-site diagnosis of garlic field, the authors are mainly caused by aphids, breeding flies, thrips, and leaf miners. For these pests, it is necessary to distinguish between them.
First, the locust
The aphids that harm garlic are radish, cotton aphid, peach aphid, and medlar, which are yellow, green, yellow-green, and cherry red. When the temperature is high, it is beneficial for them to continue to harm. As the insect sucks the juice, the blade can be curled and deformed, and the seriously damaged garlic leaves die. Prevention and treatment methods: First, use 50% anti-Pu Wei WP for 10 to 18 grams per mu, spray 40 to 50 kg for water; and use 20% fenvalerate EC 3000 to spray.
Second, the fly
Also known as the cellar. There are species of flies and green onions that harm garlic. The two species of flies are similar in shape. The larvae are milky yellow mites with a body length of 0.7 to 0.9 cm and 7 pairs of fleshy protuberances at the tail. The larva damages the garlic bulbs in the ground, causing the garlic tissue to gradually fester, the heart leaves yellow due to the loss of nutrient supply, and the serious whole plant is dead. Control methods: First, the field has been planted, when the topdressing is changed to all kinds of manure to decomposed vegetable organic fertilizer, or refined organic compound fertilizer; second, sprayed with 90% crystal trichlorfon 1000 times liquid, found garlic seedlings Where there is a piece of dead, use the root application; the third is to use 2% emamectin benzoate 5000 times solution or 40% phoxim 1000 times solution to fill the root; the fourth is convenient place for irrigation and drainage, It can be irrigated continuously for 1 or 2 times to make the ground suffocate and die.
Third, Hummer
Most of the garlic is a green onion horse, often occurring in the dry season of autumn and winter, 6 to 10 generations per year. Adults and nymphs are small, pale yellow or dark brown. Generally, the juice is sucked on the leaves and sheaths of garlic. The leaf color is faded and photosynthesis is blocked. Garlic, which is mainly based on green garlic, is the most harmful. Control method: use 20% fenvalerate, 10 ~ 25 ml per acre, spray 50 kg of water, spray once every 5 to 7 days.
Fourth, the leaf miner
Four generations occur in a year, with larvae or pupa overwintering in the leaves of host plants. The larvae are like tubular sputum, mostly after the end of autumn and April of the following year. The larvae sneak into the leaves and eat the mesophyll, which makes the gray-white curved channels appear on the leaves, which seriously hinders the growth and development of garlic. Control methods: First, remove the residual leaves of garlic that have been damaged in the field, and use it to reduce or spread the insects; secondly, use 10% of the insect growth regulator 10% fly amide suspension to spray; Spray with 10% imidacloprid wettable powder 1000 times.
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