Does high temperature weather affect pollination of fruit trees at flowering stage?

High temperature weather will affect pollination of fruit trees at flowering stage. Timely artificial pollination and bee pollination will also be one of the important management measures to improve the fruit setting rate. The specific artificial pollination methods are as follows:

(1) Collect pollen, select suitable pollinated varieties, pick flowers at bud or early flowering stage, take them indoors to remove petals, pollen and silk, or rub two flower centers together, so that all the anthers fall on glossy paper. Put it in a dry and ventilated place and dry it in a cool place. Keep the indoor temperature at 20 ~ 25℃ and the relative humidity at 50% ~ 70%. Turn over at any time to accelerate the spread of pollen. 1 ~ 2 Trichosanthes kirilowii can be used after the pollen is broken and weighed.

(2) Pollination methods There are two methods of artificial pollination: artificial point pollination and liquid pollination.

When feeding artificially, mix 1 part of pollen and 2-5 parts of talcum powder or dry starch evenly, and put them into clean vials for later use. Pollination tools include writing brush, rubber head and so on. When pollinating, use a pollination tool dipped in powder to give the stigma of each central flower, and you can give 5- 10 at a time. Artificial planting saves pollen, and the results are accurate and reliable when it is rainy or windy during flowering, but it is time-consuming and laborious.

Liquid pollination first prepares pollen liquid. 250g of sucrose, 5kg of water and15g of urea are evenly mixed to make 5% glycosuria, then10-12g of pollen is added and evenly mixed, impurities are filtered by gauze, 5g of boric acid and a little diffusing agent are added before spraying, and then cloth can be sprayed. Generally, the best spraying time is when 60% of the flowers on each tree are in full bloom. Liquid pollination saves labor and time and is suitable for large-scale production, but it needs a lot of pollen. The average fruit setting rate of artificially pollinated Red Fuji orchard is 68%, and the fruit setting rate is obviously reduced. According to the investigation, the fruit deviation rate of natural pollination orchard accounts for 45%, while that of artificial pollination orchard is only 265,438+0%.

Putting bees in flowering period can also improve the fruit setting rate, and orchards with conditions should pay attention to attracting bees in flowering period. The pollination range of bees is 40-80m, and 1 box of bees can ensure 6-8mu orchard pollination. It is best to put the hive in the center of the pollination range so as to pollinate evenly.