After the pears fall, various pests and diseases turn from the overwintering sites to the hazardous sites. This is a critical period for the prevention and control of pests and diseases. The main prevention and control diseases are pear rot disease, pear ringworm, pear black spot disease, and insect pests. Pyrus malpighi, pear stem bee, pear real bee, crickets, beetles, crickets, locusts and so on.
Pear rot disease and pear beryllitis disease are the peak period of pear rot disease and pear ring rot disease in the spring. Prevention and cure should continue to cure the old fin skin and lesions on the branches, and use 45% Schneider after scraping. Ning 50 to 150 times liquid smear.
Pear scab is overwinter in the scales of diseased shoots. By spring, diseased shoots of pear trees begin to grow into diseased shoots. A diseased shoot can produce 100,000 to 700,000 spores in one day, and can produce spores for 38 to 57 days. The more the diseased shoots are, the more strains of bacteria are in the field, so after the fall, we must strengthen the prevention and cure of pear scab. Methods: First, remove the diseased tip, burn or deep-buried; second, spray protective fungicides.
Spiral borers occur 2 or 3 generations a year, and have the habit of turning buds and transforming fruit. At this time, the pear borers in the dead calyx are transferred to young fruit when the young fruit develops to the size of the thumb. Larvae can jeopardize 1 to 4 young fruit, so use 40% of good labor and other systemic insecticides for control.
Pyrus malpighi, also known as Oriental fruit moth, Peach Pieris. It occurs 4 to 5 generations a year. Pears and plums planted around pear trees generally endanger peaches and plum trees, and they mainly harm young shoots. Therefore, we must cut off the damaged insects.
Pyramid bee is also known as larvae and cuttlebone. One generation occurs in a year. At this time, the adult begins to lay eggs. When the new shoot grows 10 to 15 centimeters in length, 6 to 7 centimeters of shoot shoots at the tip to lay eggs. Therefore, it is necessary to spray the insects to prevent and control adult worms, and to cut off the shoots. Cut off 3 to 4 cm below the incision.
Pygma is a generation of one year old, mainly in the flowering period to the fruit period of 1 month time to carry out the harm, this time the larvae are generally in the calyx, to spray the systemic agent for prevention and treatment, available 40% good labor plus 2.5 % pheromone for prevention and treatment.
In the prevention and treatment should pay attention: the concentration should not be too high, the concentration is too high is likely to cause fruit drop; fungicides use protective fungicides; if the drought, use a small water, do not flood irrigation, otherwise it will accelerate the growth of nutrition, easy Causes fruit drop; after falling, spray 0.5% borax solution, calcium chloride solution or calcium nitrate solution.
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