The Latest Solutions for Low Fruit Set in Lychee

Lychee is a fruit deeply loved by consumers and one of the crops chosen by many growers, but during cultivation, the phenomenon of low fruit set in lychee can occur, seriously affecting lychee yield. So is there any way to improve the fruit set rate of lychee? Let's take a look together during the break.

1. Bee release or artificial pollination

Lychee is a crop with unisexual flowers, meaning it cannot pollinate itself and requires a pollination medium to set fruit. When the weather is favorable, releasing bees or using artificial pollination can improve the fruit set rate. Generally, 0.5-1 hive is placed per mu, brought into the orchard 3-5 days before flowering. Artificial pollination can increase the reasons for female flowers, achieve the effect of cooling and increasing application, and prolong effective pollination. Generally, on a clear morning, collect the opened male flower panicles, filter them with clean water, then add borax and fruit-setting hormone. During pollination, dilute with water and spray onto the female flowers.

2. Shake branches and spray water

When encountering rainy weather during full bloom, shake the branches promptly after the rain clears to shake off the rainwater on the flower panicles, accelerating flower drying and pollen dispersal, so as to avoid the phenomenon of flower rotting. If it is hot and dry when female flowers are in full bloom, the sugar solution on the stigma becomes viscous, which is not conducive to nectar collection and pollination. Therefore, at this time, irrigation and water spraying can be done to increase humidity and reduce the viscosity of the sugar solution, so as to facilitate pollination.

3. Prevent diseases

When the third batch of male flowers opens, if there is hot and rainy weather, they are highly susceptible to infection, which will cause the male flowers to lose vitality and be unable to pollinate. Therefore, measures should be taken promptly for prevention. One week before flowering, spray a low-concentration carbendazim agent or thiophanate-methyl for prevention. After rain, shake the branches promptly to speed up the drying of the flower panicles and reduce the probability of disease occurrence. When the disease is severe, mix carbendazim and powdered filler at a ratio of 1:9, wrap it in a gauze bag and tie it to the end of a bamboo pole, then shake it over the affected parts to control the spread of the disease. In addition, flower thinning can also control the disease.

4. Preserve flowers and fruits

Ten days after female flowers are in full bloom or when young fruits set, foliar fertilization can be used to preserve flowers and fruits. Dissolve 50 grams of borax, 100 grams of urea, and 50 grams of monopotassium phosphate in 50 kg of water, then spray on the leaves. When the fruit begins to grow, dissolve 100 grams of urea, 50 grams of monopotassium phosphate, and 1-1.5 grams of fruit-setting hormone in 50 kg of water and spray, which can achieve an excellent flower and fruit preservation effect and improve the fruit set rate.

The above is an introduction to what to do about low fruit set in lychee. We hope it can help you. To learn more related knowledge, please stay tuned to us.