Abstract:

With the continuous expansion of planting scale of kiwifruit in Guizhou, the harm degree of black spot disease of kiwifruit is increasing, and the economic loss is also increasing. This paper analyzed the characteristics of continuous rainy weather in May-July from 2020 to 2022 by using the survey data of 20 red cartridge kiwifruit bases such as Guizhou Miluo and their fruit black spot disease, and the daily average temperature, precipitation, average relative humidity and average low cloud cover during the growth period of red cartridge kiwifruit from May 1 to July 31. The quantitative relationship between black spot disease and continuous rainy weather was discussed according to the occurrence place and incidence of black spot disease, and the threshold of continuous rainy weather was determined. The results showed that black spot disease of red cartridge kiwifruit was closely related to varieties. During the growth period of red cartridge kiwifruit from May to July, when the continuous rainy weather was 15 days and above, the daily average temperature was 20.0℃ and above, the daily average relative humidity was 90% and above, and the daily average low cloud cover was 0.90 and above, black spot disease would definitely occur in red cartridge kiwifruit. This index can be used as a meteorological early warning index for the occurrence of black spot of red cartridge kiwifruit. The meteorological disaster assessment model of red cartridge kiwifruit black spot was established to provide scientific reference for the meteorological assessment service of red cartridge kiwifruit production.

Key words: overcast rainy, temperature, black spot disease, red cartridge kiwifruit, meteorological factors, early warning indicators, meteorological disaster assessment model