Zucchini flower drop and fruit drop affect yield; how to protect flowers and fruits?

    In greenhouse zucchini, during the middle and late stages of fruit setting, flower drop and fruit drop occur to varying degrees, and vegetable growers do not know how to prevent and control it, which affects yield. Now the editor will introduce the prevention and control measures for zucchini flower drop and fruit drop:

Zucchini

    I. Temperature control in the greenhouse

    After zucchini sets fruit, regulate the greenhouse temperature to 22°C-26°C during the day and 15°C-18°C at night, increase the day-night temperature difference, accumulate nutrients, and promote fruit enlargement. The greenhouse temperature can be regulated by uncovering and covering the straw mats on time and ventilating in time.

    II. Light control in the greenhouse

    Uncover and cover the straw curtains in time to extend the zucchini lighting time as much as possible and increase light intensity. Remove and wipe clean broken grass and dust on the greenhouse film in time to increase light transmittance and raise the temperature.

    III. Strengthen water and fertilizer management

    If the zucchini plant leaves are dark green and thick, but it flowers without setting fruit, supplement boron fertilizer in time. During the period when zucchini first shows flower buds, spray chlorophyll or Baoshibao on the leaves once about every 10 days to prevent poor development of zucchini flowers and fruits caused by insufficient trace elements such as boron, which leads to flower drop and fruit drop. Also press the vine tip down with a larger clod of soil to inhibit excessive growth of the zucchini plant. If the plant is thin and weak, with yellow and thin leaves, water and fertilizer must be increased, and the first female flower should be removed to promote vegetative growth.

    IV. Prevent poor fertilization

    Flower dipping to protect fruits is the main measure to prevent flower drop and fruit drop caused by poor fertilization. Zucchini can set fruit only by artificial pollination or treatment with hormones such as 4-CPA. The method is to pick male zucchini flowers that open on the same day at around 10 a.m., remove the corolla, and gently smear the stigma of the female flower for artificial pollination, or select female zucchini flowers that are about to open and use a mixed solution of 2,4-D at a concentration of 0.002% and gibberellin at a concentration of 0.003% to dip and smear the stigma of the female flower and the fruit stalk, promoting zucchini enlargement and preventing poor fertilization.

    V. Prevent and control pests and diseases in time, and remove residual branches and fallen leaves

    Another cause of zucchini flower drop and fruit drop is pests and diseases. Prevent and control pests and diseases in time, strengthen ventilation, reduce humidity in the greenhouse, apply pesticides regularly, and remove fallen petals and diseased and old leaves in time. In addition, to prevent pathogens from invading from the petal area at the top of the zucchini, a layer of carbendazim powder can be applied there.