Pyramid is a common pest in pear orchards. In the 1990s, it was common in the pear orchards in central Guizhou, Shenyang, Liaoyang, and Anshan in key pear producing areas in Liaoning Province. After injury, the main veins at the petioles were black on both sides, and the leaves and leaves adhered to Together, it causes early defoliation, weakened tree vigor and poor flower bud differentiation, affecting fruit yield and quality. The following is a brief summary of the occurrence and prevention of pear hibiscus.
1 The law of occurrence of pear hibiscus
The pear hibiscus occurs three or four generations in areas such as Liaoyang and Anshan. Adults spend their winters in branches, weeds and earth seams. The overwintering adults started their activities in early March (the average temperature was above 0°C) and were most active around noon on a sunny day. The middle and late March (average temperature of 4 to 5°C) is the peak period of the outbreak, and the end of April is the end of the outing. The adult spawning period lasted from late March to early April. It was mainly produced at the base of the pear shoots and at the wrinkles of short fruit branches. The subsequent generations of spawning were mainly on the serrated edges. The first eggs are yellow-brown and begin hatching in mid-April (open pear blossom buds), and are yellowish-white when hatched. The nymphs are afraid of light and like to harm them in hidden places. For example, the bases, petioles and pedicels of buds are transferred to the backs, leaves, and fruits of the leaves at the late stage. At the same time, a large amount of mucus is secreted, and the body is buried in them, resulting in leaves Bonding. In the middle and late May of the year, the first generation of adults emerged as the peak period; from late June to early July, it was the second generation of adults; in early August, the adults of the overwintering generation appeared. At this time, summer-type adults and winter-type adults were mixed; September In the middle of the winter, the adult stage occurs. In early October, the adult began to winter.
2 The critical period of prevention and control
The overwintering period is based on the habits of the pear tree in the bark cracks, weeds and deciduous wintering, the winter to clear the garden, scrape the bark, the dead branches, leaves, weeds and old bark concentrated burning, reducing the overwintering base.
In the middle of March, the high temperature of Pear syriacus hermits emerges in the middle and late March. At this time, the temperature is relatively low, the adult activity is poor, the pear leaves have not yet emerged, and the adults are exposed on the shoots. This is the most favorable opportunity for chemical control and prevention. The second time can effectively eliminate adult worms. Its pharmaceutical agent is 30% Baiyin No.3 EC (produced by Hebei Petrochemical Research Institute) 1 500 times liquid, and 28% Lixing No.1 EC (made by the Beijing Military Region North Pesticide Factory) 1000 times, with a control effect of 95.7 %, 91.7%.
The first generation of eggs hatched in mid-April (about 90%), and the newly hatched nymphs were more concentrated. The preferred agent is 10% net wettable powder 3000 times liquid, 0.8% chlorpyrifos (manufactured by Shenyang Agricultural University) 2000 times, and the control effect can reach 91.7% and 92.0%.
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