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<p>Protective coverings for grapevines reduce the detrimental effects of harsh weather conditions, including excessive rainfall, hail, high temperature, and intense solar radiation. The coverings modify the microclimate by altering light intensity and quality, temperature, relative humidity, and canopy moisture. Such changes can influence phenological changes, often leading to an early harvest and reduced exposure to adverse weather conditions. The present study was therefore planned for 2&#xa0;consecutive years, i.e., 2021 and 2022, to investigate the effects of different colored protective coverings on grapevine microclimate, phenology, yield, and disease incidence in a&#xa0;subtropical continental monsoon climate. ‘Flame Seedless’ grapevines trained on a&#xa0;bower system were covered at the time of pruning until leaf fall with yellow, blue, and transparent coverings. Blue and transparent coverings recorded the highest temperature and lowest relative humidity underneath, compared to control. Grapevines with a&#xa0;yellow protective covering had the earliest bud burst, advanced by 6.00 and 4.75 days in 2021 and 2022, respectively. The harvest was 7&#xa0;and 7.5&#xa0;days earlier under blue covering for both years. Also, protective coverings reduced yield losses 9.8-fold and 6.6-fold compared to the uncovered control. Under the protective coverings, anthracnose and downy mildew incidence were greatly reduced. Our findings show that the colored protective coverings cause phenological changes at each stage, including early bud bloom and harvest time. This method could reduce losses of ‘Flame Seedless’ grapes by limiting weather damage.</p>

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Microclimatic Changes Due to Colored Protective Coverings Modulate Grapevine Phenology, Yield, and Disease Prevalence

  • 期刊论文

  • 发表日期：

    2026年6月23日

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  • Shubhkiran Kaur,
  • Rachna Arora,
  • PPS Gill,
  • Gagandeep Kaur,
  • Anita Arora,
  • Kashish Bajaj

摘要

Protective coverings for grapevines reduce the detrimental effects of harsh weather conditions, including excessive rainfall, hail, high temperature, and intense solar radiation. The coverings modify the microclimate by altering light intensity and quality, temperature, relative humidity, and canopy moisture. Such changes can influence phenological changes, often leading to an early harvest and reduced exposure to adverse weather conditions. The present study was therefore planned for 2 consecutive years, i.e., 2021 and 2022, to investigate the effects of different colored protective coverings on grapevine microclimate, phenology, yield, and disease incidence in a subtropical continental monsoon climate. ‘Flame Seedless’ grapevines trained on a bower system were covered at the time of pruning until leaf fall with yellow, blue, and transparent coverings. Blue and transparent coverings recorded the highest temperature and lowest relative humidity underneath, compared to control. Grapevines with a yellow protective covering had the earliest bud burst, advanced by 6.00 and 4.75 days in 2021 and 2022, respectively. The harvest was 7 and 7.5 days earlier under blue covering for both years. Also, protective coverings reduced yield losses 9.8-fold and 6.6-fold compared to the uncovered control. Under the protective coverings, anthracnose and downy mildew incidence were greatly reduced. Our findings show that the colored protective coverings cause phenological changes at each stage, including early bud bloom and harvest time. This method could reduce losses of ‘Flame Seedless’ grapes by limiting weather damage.