Abstract:

The cell wall surface and intercellular layer were filled with reagents after spraying calcium based composite polymer, which could significantly change the overwintering performance of kiwifruit. The cut and wound of kiwifruit branch were not frozen and thawed, which reduced the alternate freeze-thaw injury,with the field incidence did not exceed 2.18%, and the prevention effect was not less than 84.5%. The field control effect was better when Cu (OH) ₂ was added to the composite polymer. The incidence and prevention effect of kiwifruit sprayed with calcium based composite polymer adding Cu (OH) ₂once were 1.34% and 90.5%, respectively, while incidence and prevention effect of kiwifruit sprayed with calcium based composite polymer adding Cu (OH)₂ twice were 0.96% and 93.1%, respectively. The net photosynthetic rate, stomatal conductance, transpiration rate and total chlorophyll content of the susceptible kiwifruit plants after spraying calcium based composite polymer adding Cu (OH)₂ for 3 months were 48.1%, 57.3%, 24.8% and 69.9% higher than those after spraying for 1 month, respectively. The intercellular CO₂ concentration was reduced by 16.0%. When there was white bacterial pus, calcium based composite polymer adding Cu (OH)₂ could be sprayed for treatment, with the cure rate not less than 87.5%.

Key words: calcium based composite polymers, spray, kiwifruit, canker