Nanguo Pear has a beautiful name, that is, "the king of pears". The origin of this name and its flesh is delicate, refreshing and juicy, and the flavor is strong and can't be separated. Today, Hui Nongwang Xiaobian wants to introduce the pests and diseases of Nanguo Pear. Types and their control techniques.
1 black star disease
1.1 Artificially eradicating pathogens Before the germination or at the end of autumn and winter after defoliation, thoroughly clean the orchard, concentrate the deciduous and fallen fruit buried or burned, reduce the source of overwintering bacteria, and reduce the density of pathogenic bacteria.
1.2 Prevention of dormancy period Spraying 3~5°Be stone sulphur mixture before germination, it can also spray 10 times ammonium sulfate or 15 times urea solution.
1.3 The prevention and control of the growth period focuses on the key period of black spot disease infection, that is, grasping both ends, one is the young fruit period after falling flowers; the other is the fruit before the ripening period is 1 to 1.5 months before harvest. Spraying once after the spraying time, spraying once every 10 days, even spraying 3 times. Spray once in the end of July, spray once every 10 days, spray 3 times, use the following agents alternately: 40% Fuxing emulsion 8000~10000 times in the US, 62.25% Xiansheng WP 600 times in the US, 6 % Lebi ploughing 1500~2000 times liquid, 80% of American production M-45 wettable powder 800 times liquid, 70% mancozeb 800~1000 times liquid, 45% sensen ammonium water 1000~2000 Double liquid, Japan's 12.5% ​​speed Poly WP 3000 times liquid, Shenyang Pesticide Factory production 12.5% ​​fast-protecting agent 2000 times liquid, 12.5% ​​green milk copper 1000 times liquid, Green Debao 500 times liquid.
2 pear rust
Pear rust is also called brown star disease. In recent years, due to the increase of parks, cemeteries, and cypress trees, the harm of pear rust has become increasingly serious.
2.1 Manually eradicate the host to remove the host cypress around the orchard as much as possible.
2.2 Chemical control In the early spring, spray 2~3°Be stone sulphur mixture, spray 15% powder rusting WP 2000 times before flowering.
3 pear hibiscus
The town or village joint defense can achieve the desired control effect.
4 pear swollen leaves
4.1 Dormant period control Spray 5° Be stone sulphur mixture before germination.
4.2 Growth and long-term control In the late stage of April from the end of April to the beginning of May, the spraying of 2,000 times liquid, 50% parathion emulsifiable oil 1000 times or 0.2~0.3° Be stone sulphur mixture.
5 pears
5.1 Dormant period Spray 5°Be stone sulphur mixture or 3%~5% diesel emulsion before germination.
5.2 Growth and control of the growth period After the flower, the leaves are sprayed with 700 times of dicofol or sprayed with 0.2~0.3° Be stone sulphur mixture.
6 pear stem bee
6.1 Artificial control After cutting off the adult eggs, timely cut off the damaged shoots and cut them 2~5cm at the folds to kill the eggs or larvae. The pear gardens are continuously carried out at the same time, and the effect is better.
6.2 The drug kills the adult when the new shoot grows to 3~5cm (after the first half of May), the adult is sprayed at the peak, and the spray can kill the 2000 times liquid or the enemy kills 2000 times, or the enemy can be sprayed 1000 times. The liquid sprays best at around noon. It is necessary to spray the medicine uniformly and spray it as soon as possible. It should be sprayed within 1~2d.
7 peach small heartworm
7.1 Artificial control combined with autumn application of base fertilizer, the topsoil containing the overwintering canopy under the canopy is turned down or filled in the fertilization, or the soil is 5~7cm thick in the tree tray before the wintering larvae are unearthed and the film is filmed or covered. Let larvae or suffocation die.
7.2 Prevention and control under the tree After the first month of July, when the small larvae are continuously excavated, the canopy treatment can be carried out. Before treatment, the weeds in the tree tray should be removed to loosen the soil; 75% phoxim 700 times solution can be used, each plant 15~ 30kg sprayed on the ground, the ground is wet 2cm, or 667m2 mixed with 50% phoxim emulsifiable concentrate 0.5kg+15kg soil and sprinkled under the orchard tree, then mix the medicine with the soil with flat sputum.
7.3 On the tree, the detection and reporting of the peach-like heartworm attractant was used to determine the time of the fight, and the effect was good according to the number of male moths. The medicaments are: 2.5% cypermethrin 3000 times solution, 20% speed killing butyl emulsifiable concentrate 2500 times solution, 30% peach xiaoling emulsifiable oil 1500 times solution. Spray again 1 day later.
7.3.1 Artificial control to scrape bark in early spring, clean the orchard, eliminate or reduce overwintering adults.
7.3.2 Pharmacy control drugs to kill adults, the first time in early April, before the adult worms, the overwintering adult worms are easy to kill after winter, spray 5% beta-cypermethrin 2000 times solution plus 1000 times solution, 2nd At 90% of the time after flowering (early May), this is the peak period of hatching of the first generation, and the nymphs are relatively neat. The third time in the first generation of the first generation of adult emergence, in late May, you can choose 20% speed killing butyl EC 2500 times solution, 20% fenpropathrin emulsifiable concentrate 3000 times solution, 50% parathion emulsifiable concentrate 1000 times solution, 2.5 % deltamethrin 2500 times solution, 10% bifenthrin EC 3000 times solution, Tao Xiaoling 1000 times solution, omethoate 1000 times solution, alternately used.
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