When do pear trees usually blossom? As a result, what kind of medicine do the long heart worms take? Why can't you grow a family? Attached planting

Pear is a perennial deciduous fruit tree of the genus Pyrus of Rosaceae, which is widely distributed all over the world. So when does it usually blossom? As a result, what kind of medicine do the long heart worms take before and after? Why can't you grow a family? What is the planting time and method? It is reported that pear trees bloom from February to May, and the flowering period is different in different places. For example, in Huili, Sichuan, pear trees generally bloom in mid-early February and in Yanbian, Jilin Province in mid-May; Yali pears bloom in early March in Changsha, Hunan, and Beizhen in Liaoning Province in early May, with a difference of nearly two months. The phenological phase of pear trees cultivated in the same area is also different because of different species and varieties. from bud germination to flowering, Qiuzi pear varieties are the earliest, white pear varieties are a little later, sand pear varieties are later than white pears, and western pear varieties are the latest. The range of variation is about 10 days.

Before and after pear trees blossom and bear fruit, what kind of medicine do long heart worms play?

The main diseases and insect pests that need to be controlled before flowering are rot, stem ring disease, dry rot, scab, rust, root diseases, pear wood lice, yellow powder aphid, leaf mites, green bug bugs, scale insects, ticks and so on.

1. Scrape off the thick warped skin of the branches, scrape and treat rot and dry rot spots, and apply medicine to protect the wound, such as towel ointment and so on.

two。 After scraping off the rough warped skin, 30% pentazole carbendazim (Fulian) suspension 400 times, 60% copper calcium carbendazim (Tongjia) wettable powder 300 times 400 times or 77% copper calcium sulfate (Donin) wettable powder 300 times 400 times should be sprayed once to eradicate the residual bacteria in the tree.

In the first and middle of March, 4.5% cypermethrin (Tianlongbao) EC 1000 × 1500, 48% chlorpyrifos (Dingyong) EC 1000 × 1500, 25% chlorpyrifos (Haomudan) EC 800 × 1000 or 35% endosulfan (Shuodan) EC 1000 × 1500 were sprayed twice to kill the adults of overwintering pear planthopper. The effect of adding dragon lantern silicone to the medicine solution is better.

4. During the flower bud expansion period, 3-5 Baumedo stone-sulfur mixture or 45% stone-sulfur mixture crystal 40-60 times solution was sprayed once to kill the remaining overwintering pests and mites. Orchards with serious scale insects should be sprayed with 40% acetophos (fast scale) EC 800 / 1000 times.

5. After germination and before flowering, a mixture of 6000 times of 40% nitrilazole wettable powder, 2000 times of 10% difenoconazole water dispersible powder or 2000 times of 12.5% uniconazole wettable powder were sprayed once, mixed with agents to control pear planthopper adults, kill the overwintering black star pathogen and residual pear planthopper adults in the bud, and prevent rust, green bug bugs, pear stem wasps and so on.

6. When root diseases are found, pick the soil and dry in time, and then irrigate the roots with 77% copper calcium sulfate (Dorning) wettable powder 500 times, 50% carbendazim (mepaian) 500 times 600 times or 60% copper calcium carbendazim (Tongjia) 500 times 600 times.

Heart drillers:

1. Spraying 5 Baume stone sulfur mixture before pear tree germination can kill a large number of overwintering eggs of Tenebrio Molitor. Note that pear trees are extremely sensitive to sulfur, and it is better not to spray after germination. Even 0.2 Baomedo stone sulfur mixture can cause drug damage in the middle and late May.

2. From late April to early May, after the pear trees had fallen flowers, the yellow powder insects successively produced stings and turned branches, but it was also the time when a large number of natural enemies settled on the trees. Therefore, the medication needs to be heavy: if the insect situation is not serious, you can fight again before bagging, such as the first two measures are disadvantageous, there is a big trend, you can hit green pesticides such as avermectin to reduce the killing of natural enemies and the stimulation of young fruits.

In mid-late May, before bagging Yali pear, you should carefully hit it again with insecticide and fungicide. The medicine can be bagged after it is dried. It is worth noting that. Bagging must be serious, to ensure the quality of bagging, the mouth must be tight.

At the beginning of April and June, the drug was applied once before wheat harvest, which was the key to medium-term control. At the beginning of June, it was the period when the yellow powder insect was drilling bags one after another, and the wheat harvest lasted for a long time, and the fruit growers had no time to take care of the fruit trees. if the effect was not good, the yellow powder insect was given about 10 days to drill the bag calmly.

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Time: 2019-03-21 Click: