As one of the main pests that harmed poplars in early spring, it is characterized by large amount of reproduction, early occurrence, strong fulminant and long duration of damage. At present, the population of overwintering populations in the area of ​​grassy ridges in Suqian City is generally high, and the control situation is severe. Grass worms are sucking mouthpart pests. After the early spring temperatures rise, the nymphs unearthed one after another. Along the tree trunks, they crawled up on the branches of the branches of Yang, sucking on the sprouts and twigs of the shoots. In severe cases, they cause dead shoots and even tree death. Poplar trees are tall and once they are placed on trees, control is very difficult. Therefore, the barrier method is the simplest and most effective way to control grasses and ducks. Specific approach: The bark off the trunk 1 to 1.3 meters above the ground, with a wide tape tightly wrapped the tree a week, the width of 15 to 20 cm, blocking the grass climbing nymphs on the tree. The bark should be flattened during operation, the width of the tape should be up to standard, and the tape should be wrapped tightly without voids and wrinkles. It is more effective to add a poisonous ring to the upper and lower part of the barrier tape. The poisonous ring is prepared with a ratio of 1:2:30 of 4.5% beta-cypermethrin EC, 40% dichlorvos EC, and waste engine oil, and the width is 5 to 10 cm. Pay attention to the regular maintenance of the barrier tape, re-add the tape after the tape is loose or loose, and continue to add the coating after the poison ring is air-dried, until no tussock nymphs have been unearthed. For those who have not taken the barrier method to prevent and control grass nymphs and nymphs have been put on the tree, they may take medicine spray or trunk punching and other methods. A mixture of 40% omethoate EC (1500 times solution), 2.5% deltamethrin EC (400 solution) and 0.1% neutral detergent powder can be used for spraying with medium and high lift sprayer. Puncture and injection medicine prevention and treatment apply to poplars with breast diameter greater than 10 cm. A hole is drilled at an angle of 45 degrees every 5 centimeters around the base of the trunk and reaches deep into the xylem. 40% of oxygen is injected with the injection machine or medical syringe. In the case of emulsifiable concentrates, such as emulsifiable concentrates, the original drug can be used in March-April, and diluted three times in May, and then the injection hole can be sealed with wet soil. Usually 1 ml of liquid medicine is injected into the tree per cm of diameter.
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