Poplar is one of the main tree species for afforestation and afforestation in northern Jiangsu. In recent years, the planting area has rapidly expanded. However, due to the single tree species and the lack of control technologies, the occurrence of pests and diseases is serious. Grass scorpion is one of the pests that damage early poplars. Grass filariae occurs in the Yancheng area for one generation a year. It has characteristics such as small body size, strong fertility, large amount of insects, and difficulty in control. Due to the tall poplar tree body and the waxy layer on the surface, the nymphs, once put on the tree, often cause a large number of invalid sprayings due to a single chemical control, which not only pollutes the environment, but also has poor control effect. Through several years of practice, the author improved the traditional prevention and control measures and achieved a good pest control effect.
Forest Technology (1) Clean woodland. After the fallen leaves in the autumn and winter seasons, the litter and weeds near the victim trees were thoroughly cleaned and burned to eliminate the overwintering egg mass. Surveys have shown that the number of grasshoppers and nymphs unearthed from cleared land can be reduced by 12.6%. (2) Winter frozen eggs. With the roots of the tree as the center, a 20 cm deep turn of the soil within a radius of 1 meter can freeze large amounts of eggs, reduce the density of the larvae in the coming year, and at the same time promote the growth of poplar roots. The severely affected forestland must be fully turned over. When tumbling, pay attention to collect the oocysts in the soil and focus on incineration.
Barrier technology barrier is a key technology for controlling poplar ramification, easy to operate, low cost and good effect. (1) Tape blocking. In late January, the old bark is scraped at a height of 1.3 meters at the base of the trunk. The width is 15 to 30 centimeters. It is required that the scraping surface should be as smooth and smooth as possible. Do not injure the phloem. Individual furrows or holes can be leveled with mud and then tie the width. 8 ~15cm Scotch tape, leaving no gaps, sticking firmly, so that the nymphs of the grass worms are blocked under the tree. Check whether the tape ring is damaged or detached every day, and if there is any gap between the tape ring and the bark, remedy it in time. (2) drug barrier. Twenty milliliters of 2.5% deltamethrin EC, 10 mL of 20% acephate EC, and 1 kg of waste engine oil are mixed before the nymphs are placed on the tree, and a closed loop of 50 cm in width is applied at the base of the trunk 1 meter; or with butter (Lubricating oil) Apply a closed loop directly on the trunk, with a width of 3 to 5 cm, which can kill a large number of tree nymphs. (3) Mixed barriers. For forest lands with a high population of insect populations, tapes and tapes should be used to block and construct two defense lines. The tape is on the top and the tape is on the bottom. The distance between the two is 50-60 cm. A few years of practice have proved that the three aspects of barrier prevention and control cannot be loosened: one is to "early", and the barrier tape must be attached before the end of January; the second is that the barrier tape should be changed frequently, and it should be changed every 15 to 20 days. Blowing, sun exposure, and rain will cause aging of the tape, the surface is not smooth enough, and the efficacy of the tape will also be reduced. Third, comprehensive prevention and control, whether the victim is wood or non-victim damaged wood, each plant must prevent.
Artificial or pharmaceutical insects on the land with high phytophthora number simply block and not clear the blocked nymphs. Most of the nymphs can still damage the trees through accumulation of worms. Therefore, in the implementation of the barrier must be supplemented with artificial insecticide or insecticide means to timely cull nymphs blocked under the tape or tape. The insecticide can be sprayed with 40% phoxim EC 1500 times, 2.5% deltamethrin EC or 4.5% beta cypermethrin EC or 1.8% avermectin EC 2000 to 2500 times, and the nymphs emerge at 4 pm Application of pesticides, determine the number of days between application based on the situation of insects.
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