Occurrence and control of pear gibberella

The adult began to Eclosion in late April and bit a flat round hole in the first and middle of May. The adults feed on the leaves during the day after coming out of the hole, and lie still on the leaves sooner or later, and have the habit of falling to the ground and false death. The adult began to lay eggs in about 10 days after coming out of the hole, and the trunk crawled at the front of the oviposition. The ovipositor was inserted into the rough and warped gap of the bark to lay eggs. Most of the eggs were laid in the branches of more than 2 years old, 3 eggs were laid in one place, and each female could lay 40 eggs. The peak spawning period is in mid-late May and the peak incubation period is in early June. After hatching, the larvae first ate into the cortex, and the damaged cortex appeared water-stained black spots, which gradually expanded and cracked, much like rot spots.

The hatching time of adults is different, and the larvae are eaten into the branches after hatching, so it is difficult to control. The two-year control experiment shows that good results can be obtained by grasping the following four aspects of control.

The main results are as follows: 1. combined with winter pruning, cut off the branches harmed by pests, scrape off the rough warped bark, and clear the garden in time to reduce the source of overwintering insects.

2. From the first ten days of May, the adults were sprayed once every 10 days, and the adults were killed three times in a row. The effect is better when 40% chlorpyrifos EC 800 Mel 1000 times or Regent EC 1500 Mel 2000 times is used.

3. Make use of the habit of adults falling to the ground and false death, organize manpower to vibrate trees in the early morning to kill adults.

4. After the larvae hatch into the cortex, the sunken part of the victim becomes black, which is easy to identify, and the subcortical larvae can be removed with a knife; or the larvae can be killed by delimiting several channels longitudinally in the injured area and going deep into the xylem with a knife; or 20 times of 80% dichlorvos EC can be injected into the insect track and sealed with yellow mud to fumigate the larvae.

Among the above four methods, timely and continuous spraying of adults can effectively control the harm of pear bugs, which is the key period of control. In addition, the control of adults should be stopped one month before the fruit harvest, and the insecticide injection into the branches to kill larvae should be carried out after the fruit harvest to ensure the edible safety of the fruit.