How to prevent and control kiwifruit blossom blight? A detailed guide to practical methods

After fruit harvest and before the ground freezes, carefully clear weeds, fallen leaves and other debris from the orchard, and gather them to burn outside the orchard or bury deep. Pay attention to drainage in the orchard to ensure ventilation, light penetration and suitable humidity. After fruit harvest, spray the whole orchard with Jinlishi at 1500-2000 times dilution. At the bud break stage and from the early stage of sepal cracking to the flower bud swelling stage, alternately spray the whole tree and whole orchard with kasugamycin, agricultural streptomycin, etc.

1. Agricultural measures

After fruit harvest and before the ground freezes, carefully clear weeds, fallen leaves, leftover fruit, diseased and pest-infested branches and dead branches from the orchard, and gather them to burn outside the orchard or bury deep to prevent the spread of pathogens. Pay attention to drainage in the orchard, thoroughly eliminate dense row spacing, dense plant spacing, dense branches and overlapping leaves in the orchard, ensure ventilation, light penetration and suitable humidity, destroy the living environment of pathogens and reduce the pathogen base.

Around the winter solstice, concentrate winter pruning at one time, and carry out heading back, cutting back and thinning according to the method of more buds and fewer branches to reduce the probability of blossom blight occurrence. Strengthen water and fertilizer management in the orchard, promote balanced fertilization technology (combined application of organic fertilizer + inorganic fertilizer + mineral fertilizer + biological bacterial fertilizer), lower soil pH, ensure healthy tree growth and improve the ability to resist disease invasion.

When hand-pollinating, choose healthy pollen free of pathogens to reduce the risk of infection, keep orchard drainage unobstructed, ensure no standing water in the orchard after watering and no accumulated water after rain, and reduce humidity in the orchard.

2. Chemical measures

After fruit harvest, spray the whole orchard with Jinlishi at 1500-2000 times dilution to reduce the pathogen base. At the bud break stage and from the early stage of sepal cracking to the flower bud swelling stage, alternately spray the whole tree and whole orchard with kasugamycin, agricultural streptomycin, etc.

At the early bud emergence stage, spray fungicides over the whole orchard, such as pyrimethanil, zhongshengmycin, polyoxin, etc. When spraying, be careful and do not just go through the motions; rotate the chemicals. For plots or varieties with severe disease, it is best to mix protective agents (commonly used ones include bingsenzin, daimeng suspension concentrate, etc.) with therapeutic agents to achieve the purpose of both treatment and protection.