Prevention and Control Techniques of Lixiaoshouxin Pest in Three Northern Semiarid Regions
Li Xiaoyao, also known as Lisamidae and Li Xiaozheng, are widely distributed in Heilongjiang Province and are extremely harmful. In order to effectively control the disaster situation, the following describes the whole process of life and effective prevention and control measures of Li Xiaoxinxin.
First, the degree of harm
It mainly harms plums, apricots, and cherries, especially to plums. The victim plum was presented with "red bean paste" (the larvae eat the fruit and put the brown fecal grains in the fruit). It turns red early and falls off prematurely. The perennial injury rate reaches 20% to 50%, resulting in lack of production and income. The serious plum garden, due to untimely prevention and control, resulted in the pulling of the tree garden, causing serious economic losses.
Second, adults
4.6mm to 6mm in length, grayish-brown, dull, 10.5mm to 15mm wingspan, 10 groups of white twills on the front edge of the forewings, white phosphorous on the wings, and a small white spot on the middle of the wings . The larvae are 10mm to 13mm long, yellowish or pink. Yellow-brown, body length 6.8mm ~ 7.4mm.
Third, the law of occurrence
In Heilongjiang, two generations occur every year, and the second or third generation of mature larvae do the overwintering under the soil, near the grass roots, or under the rocks. The maximum amount of insects is from 1cm to 5cm below the ground at a distance of 30cm to 90cm from the main trunk. The overwintering larvae were unearthed at the end of April in the second year of the year and were gradually emerged in late May. The peak of emergence was in early June. The first generation of larvae began to see the end of May and June. The larval period was 15 to 40 days. It began to mature in mid-June and was gradually dehydrated. The first generation of adults appeared in late June, the adult period was 1 month, and the peak period was concentrated in about 1 week. The whole process was completed in about one month, about one and a half months in slow, and generation overlapped. Adult eclosion can be spawned at the time and the egg period is three or four days. The second generation of adults emerged and spawned in early August. Until late August and early September, the third generation larvae gradually matured into the earth to make winter. Before the winter larvae excavated, there was a habit of making a second twist. The overwintering adults spawn at foliar or petiole at the final flowering stage, and the later generations spawn eggs at the carcass of the fruit, increasing the amount of eggs laid. The second-generation egg produces 2 to 4 capsules on some fruit carcasses and 5 to 6 capsules on the third generation. Larvae have a habit of crawling on fruit after hatching. The first-generation larvae were killed by 18%, the second-generation larvae by 60%, and the third-generation larvae by more than 80%.
Fourth, prevention and control technology
1. In each generation of adult and spawning period (overwintering best), with 90% trichlorfon 800 times, or 50% of malathion EC 1000 times, or 50% of dichlorvos EC 800 times .
2. Before plum physiological fruiting (first-generation mature larvae in the soil), the ground can be controlled by spraying 1000-1500 times of 50% phoxim EC on the soil under the canopy.
3. At the end of flowering (95% drop), when the small fruit has the size of wheat grain, spray the first medicine, and use dichlorvos, enemy killing, killing the fast, killing the blessing, every 7~10 days Spray 1 time, the effect is very good.
4. Can be used for biological control of soil treatment under the crown, such as Beauveria bassiana, or put chickens in the orchard for pest control.
5. Always keep the sanitation in the park and sweep the nets to achieve the goal of reducing the source of insects in the following year.
In addition, unified prevention and control in one area is an important factor in determining the effectiveness of prevention and control.
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