Latest Causes of and Preventive Measures for Shatian Pomelo Flowering Without Fruiting

During the growth of Shatian pomelo, farmers often encounter the problem of flowering without fruiting, which causes relatively large losses to farmers. So what causes Shatian pomelo to flower without fruiting? What measures should farmers take to prevent it? Let's find out together.

1. Lack of pollinator trees

Shatian pomelo has a low fruit-setting rate under self-pollination. If pollinator trees are lacking, a large number of flowers will appear, but the fruit-setting rate will be very low. Therefore, cross-pollination is needed to significantly increase the fruit-setting rate. So pomelo varieties with a large amount of pollen, strong pollen viability, and a flowering period close to that of Shatian pomelo should be selected as pollinator plants, so that the proportion of pollinator trees in the whole orchard reaches about 10% to 15%. In addition, artificial pollination can also significantly increase the fruit-setting rate of Shatian pomelo, but it is rather cumbersome. Alternatively, keeping bees in the pomelo orchard during the flowering period can also promote pollination and significantly increase the fruit-setting rate.

2. Adverse weather during the flowering period

If continuous rainy or low-temperature weather occurs during the flowering period, or if the orchard soil is dry or the air is dry, these are all unfavorable to fruit setting. After Shatian pomelo experiences long-term low-temperature and dry weather in winter, when the temperature rises, the root system will slowly resume normal growth. At this time, fully decomposed farmyard manure needs to be applied, diluted into a thin water-fertilizer for application. Be sure to avoid too high a concentration, which can damage the roots and affect the sprouting of new roots. In addition, quick-acting nitrogen fertilizer must be strictly controlled, especially for fruiting trees and excessively vigorous trees.

3. Pests and diseases during the flowering period

If Shatian pomelo is damaged by pests such as citrus blossom midge and scarab beetles before flowering, and if control is not thorough, fruit setting will be seriously affected. Therefore, during the flowering period, control of citrus blossom midge and scarab beetles should be strengthened. To control citrus blossom midge, when the flower buds just turn white, loosen the soil around the tree disc, then immediately apply pesticide to the ground and spray the tree canopy. For ground application, carbaryl powder or phoxim can be selected; for canopy spraying, pyrethroid pesticides can be selected. Alternatively, before adult emergence from the soil, plastic film mulching can be used so that adult citrus blossom midges cannot fly out from underground and die underground. Scarab beetles cause damage during the flowering period. The flowers secrete nectar and aromatic substances, which often attract scarab beetles. Pesticides can be sprayed before flowering, or scarab beetles can be captured manually during the flowering period.

4. Improper fertilizer and water management

Improper fertilization can also affect the fruit-setting rate. Fertilization should combine soil application with foliar application. Generally, furrow, hole, or radial fertilization is used, mixing the fertilizer evenly with the topsoil and then applying it in layers, followed by covering with soil. When the plant shows a deficiency of trace elements such as boron and magnesium, it can be supplemented by spraying foliar fertilizer. It should be noted that the organic fertilizer applied must be fully decomposed, and when applied it should be mixed evenly with soil in layers to improve fertilizer utilization and avoid burning the roots.

  The above is an introduction to the causes of and preventive measures for Shatian pomelo flowering without fruiting. We hope it can help you. If you want to learn more related knowledge, please stay tuned to us.