Conditions of Low Temperature and High Humidity in Winter and Spring Easily Lead to Red Cartridge Kiwifruit Canker Disease in Guizhou

doi:10.3969/j.issn.1000-6362.2019.09.005

Abstract

Abstract: The red cartridge kiwifruit variety “Hongyang” was used as experiment materials to monitor canker disease of red cartridge kiwifruit and measure meteorological elements at 15 sites in major growing areas at the same time from March to April during 2013 to 2018. The superposition and elimination method was used to analyze the duration of the specific index values of low temperature and high humidity at the canker disease bases in winter and spring, and combine with the locations, the time and the incidence, discussing the quantitative relationship between the duration of low temperature-high humidity and canker disease and determining the threshold value in winter and spring. The results showed that the main period of the canker occurrence and prevalence of red cartridge kiwifruit was March. The weather conditions of the daily average temperature is under 2℃, the daily minimum temperature is under -2℃ and the daily average relative humidity is above 75％ were continued for 5 days in winter the daily average temperature is under 18℃ and the daily average relative humidity is above 80％ were continued for 5 days in spring, which could help canker bacteria easily survive in trees and induce canker disease. Then utilizing the meteorological elements to verify the weather conditions of low temperature and high humidity at the 11 sites, where canker disease not occurring. The results showed that the meteorological elements could not be achieved the required weather conditions of low temperature and high humidity at the 11 sites. These were suggested that the above weather condition could be adopted as the pre-warning index of the canker disease of red cartridge kiwifruit. Besides, there were steps that we could actively organizing prevention for increasing the control effect.

Key words: Low temperature, High humidity, Canker disease, Red cartridge kiwifruit, Guizhou

CHI Zai-xiang, JIANG Shi-hua, BAI Hui, LI Gui-qiong, SUN Xiang, WANG Bei, LONG Xian-ju, . Conditions of Low Temperature and High Humidity in Winter and Spring Easily Lead to Red Cartridge Kiwifruit Canker Disease in Guizhou[J]. Chinese Journal of Agrometeorology, 2019, 40(09): 591-602.

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