What Pesticides to Use for Flower and Fruit Retention in Lychee? A Detailed Explanation of the Best Pesticide Formula

AbstractDuring the young fruit pit-filling stage 10-15 days after the female flowers bloom, combined with pest and disease control, add 0.3kg of urea and 0.2kg of monopotassium phosphate to every 100kg of water, mix well, and spray on the young fruits. During the embryo abortion stage from May 20-25, add 0.4kg of urea and 25-30ml of Baoguoling to every 100kg of water, mix well, and spray on the fruits.

I. Pesticide Formula for Flower and Fruit Retention in Lychee

1. During the lychee flowering period, 0.5-2 hives of bees can be kept per mu. At the same time, on sunny mornings from 9-11 o'clock, collect or shake off the open male lychee flowers, then place them in clean water, gently rinse, and filter. Add 0.2kg of urea, 0.1kg of borax, and 0.1kg of monopotassium phosphate to every 100kg of pollen water, stir well, and spray on the blooming female lychee flower clusters.

2. Alternatively, during the young fruit pit-filling stage 10-15 days after the female flowers bloom, combined with pest and disease control, add 0.3kg of urea and 0.2kg of monopotassium phosphate to every 100kg of water, mix well, and spray on the young fruits. During the embryo abortion stage from May 20-25, add 0.4kg of urea and 25-30ml of Baoguoling to every 100kg of water, mix well, and spray on the fruits.

II. Suitable Growing Environment for Lychee

Lychee trees prefer a high-temperature, high-humidity, sunny growing environment. The genetic characteristics of lychee require relatively low temperatures during the flower bud differentiation stage, but lower temperatures of -2 to -4°C can easily cause freezing damage; during the flowering period, clear and warm weather that is not dry and hot is more favorable. If humidity is too low, or if there is continuous rain, dry and hot weather, or strong north winds, these are all unfavorable for flowering and pollination. At the same time, if the flowering and fruiting period encounters unfavorable disastrous weather, it can also lead to flower and fruit drop.

III. How to Bag Lychee

1. Generally, in orchards with the necessary conditions, when the lychee fruits are about 50% ripe, that is, when the base of the fruit begins to turn red, the fruit clusters can be bagged. This not only prevents insects and diseases but also prevents bats; it retains moisture and lowers temperature, preventing sunscald damage to the fruit; it helps reduce evaporation, increase the temperature inside the bag, and promote earlier fruit ripening.

2. Special fruit bags, transparent plastic film bags, or semi-transparent parchment paper bags can be used. The bags are cylindrical, with a length of 30-40cm and a width of 20-25cm. The length and width are determined by the length and size of the fruit cluster. Punch some small holes with a diameter of 0.5cm in the upper part, cover the fruit cluster, tie the upper part, and leave the lower part slightly open. Before bagging, spray pesticide for pest and disease control first. When harvesting the fruit, the fruit cluster and fruit bag can be picked together.

IV. Nutritional Value of Lychee

1. Lychee is relatively rich in nutrition, containing sucrose, glucose, protein, fat, and vitamins A, B, C, etc. It also contains various nutrients such as folic acid, arginine, and tryptophan, which are beneficial to human health. Lychee has the effects of strengthening the spleen, promoting fluid production, regulating qi, and relieving pain. It is suitable for people with insufficient body fluids after illness, physical weakness, stomach cold pain, and hernia pain.

2. According to modern research, lychee has the effect of nourishing brain cells, is helpful for improving symptoms such as forgetfulness, insomnia, and frequent dreaming, and can also promote skin metabolism and delay aging.