Covering young avocado ‘Hass’ trees with high-density shading nets during the winter mitigates frost damage and improves tree performance

Abstract

Key message Covering young ‘Hass’ trees with Silver 60% shading nets during cold winters mitigates frost damage and improves tree performance, apparently through a mechanism other than increasing nighttime air temperature. Abstract Avocado is a commercially important subtropical evergreen fruit tree. Severe frost may damage foliage, floral buds, flowers and fruit, thereby reducing avocado crop yield and restricting its geographical distribution and expansion. Shading nets are frequently used to protect agricultural crops from climate-related damage. To determine their ability to mitigate frost damage, Silver 60% shading nets were deployed over young ‘Hass’ trees during two consecutive winters and uncovered trees served as controls. Freezing and chilling temperatures occurred in the experimental orchard during the winter of each year, from December to March, reaching − 2.49 ℃ in January 2022. In the control, 93% of the examined floral buds were severely damaged compared to 4% in the Silver 60% trees. Damage to young vegetative shoots was assessed at 4.35 out of 5 in the control compared to 0.5 out of 5 in the Silver 60% trees. In both years, minimum air temperatures under the Silver 60% shading nets were similar to those of the control. Leaf-level photosynthetic photon flux density was ~ 60% lower under the shading nets. In most measurements, CO2-assimilation rate, stomatal conductance, ratio of variable to maximum fluorescence (Fv/Fm) and chlorophyll concentration in the leaves of the Silver 60% trees were higher than, or similar to the controls. Trunk diameter and flowering intensity of the Silver 60% trees were higher than for the control. These results indicate that covering young ‘Hass’ trees with Silver 60% shading nets during cold winters can mitigate frost damage and improve tree performance.

Priming avocado with sodium hydrosulfide prior to frost conditions induces the expression of genes involved in protection and stress responses

“…Physiological and biochemical aspects of the response of avocado 'Hass' to chilling and frost/freezing have been studied (Joshi et al, 2020;Chung et al, 2022;Weil et al, 2022), focusing on photosynthetic performance, reactive oxygen species (ROS) and antioxidants. Possible horticultural means for mitigating frost damage in 'Hass' orchards include wind machines or highdensity shading nets (Lahak et al, 2024;Bar-Noy et al, 2019). Various foliar treatments have also been shown to be beneficial for 'Hass' under cold (chilling/frost/freezing) conditions (Joshi et al, 2020;Lemmer et al, 2022;Zilkah et al, 1996;Tiwari et al, 2023).…”