Because the fruit setting rate of self-pollination is 50%-85% and that of cross-pollination is 98%, the fruit of cross-pollination is generally larger than that of self-pollination. Among them, the white meat type is self-compatible, and the fruit setting rate of Vietnamese pitaya is 100% under normal circumstances. Because of self-incompatibility, red meat type and white meat type should be mixed when planting pitaya.
2. The white pitaya started to blossom one month later than the red pitaya. If possible, pollen can be collected and stored for later use when there is a lot of pollen. The collected pollen can be sealed, but it must be kept dry, so that the pollen activity will be high, and then stored in the refrigerator at 0-5℃.
3. When the weather is cold, rainy, windy and rainy, it will not only hinder insect activities, but also reduce pollen vitality. Using protected cultivation can reduce the influence of disastrous weather to a certain extent and improve the pollination rate of pitaya. If it rains during flowering, you can cover the bud with a bag and cover it the next morning after pollination, so that the pitaya can bear fruit smoothly.
Extended data:
Control and management of pitaya;
First, timely control pests, especially ants, cotton inchworm and other pests, reduce the population base, and add chemicals such as Pinwei, Jinboda and Boxing when spraying on the leaves.
Second, timely prevention and treatment of diseases such as canker, the following detailed introduction to the prevention skills of canker:
1, select sandy soil.
Before selecting the location of pitaya orchard, try to choose Shatu Garden to keep the soil as low as possible. Too much soil moisture will lead to the decrease of resistance of pitaya.
2. Regularly quarantine, sterilize and disinfect the orchard soil.
It is necessary to regularly use protective fungicides to disinfect the orchard soil to protect pitaya that is not infected by germs from infection. It should be noted that the effect can only be seen by spraying drugs before the crops come into contact with the disease source or before the disease occurs, and the mixture of carbendazim and sulfur can be selected. It is easy to breed diseases after rain, and more attention should be paid to the sterilization and disinfection of orchards.
3. Efforts should be made to improve the resistance of fruit trees and reduce the incidence.
Pitaya belongs to cactus family, which likes light and shade, heat and drought. Growers should pay attention to the drainage of orchards, strive to improve the resistance of fruit trees, promote the growth and development of plants, improve the ability of plants to resist pests and diseases, and reduce the incidence.
4. Choose varieties with high resistance.
At present, there is no pitaya variety with high resistance to canker. Relatively speaking, the resistance of white pitaya is higher than that of red pitaya, so white pitaya can be planted in moderation. However, the quality and unit price of red pitaya are higher, and fruit farmers prefer to plant red pitaya, which is one of the reasons why pitaya ulcers occur more and more frequently.
5. Strengthen agricultural management and apply organic fertilizer.
Fertilization should be based on organic fertilizer. Applying organic active nutrition package fertilizer, calcium fertilizer and potassium fertilizer according to soil fertility can increase the thickness of wax layer of pitaya stem and improve stress resistance.
6, ulcer prevention and treatment prescription
Pitaya canker is easy to break out in high temperature and high humidity environment, and chemical control should be given priority to. With the increase of temperature and humidity in spring, it is necessary to treat soft rot, scab and other diseases at the same time to prevent compound infection.
7. Recommended chemical control agents
Formula 1: 30% pyraclostrobin 1500 times+procymidone 1000 times +3% zhongshengmycin or streptomycin 1000 times, which can be used safely in all periods.
Formula 2: 50% phenylpropyl 2000 times +40% prochloraz 65438 times +0500 times+kasugamycin or zhongshengmycin, which cannot be used in flowering and young fruit period.
Baidu encyclopedia-pitaya