Abstract
Heat stress and resulting sunburn is a major abiotic stress in perineal specialty crops. For example, such stress to the maturing fruits on apple tree canopies can cause several physiological disorders that result in considerable crop losses and reduced marketability of the produce. Thus, there is a critical technological need to effectively monitor the abiotic stress under field conditions for timely actuation of remedial measures. Fruit surface temperature (FST) is one of the stress indicators that can reliably be used to predict apple fruit sunburn susceptibility. This study was therefore focused on development and in-field testing of a mobile FST monitoring tool that can be used for real-time crop stress monitoring. The tool integrates a smartphone connected thermal-Red-Green-Blue (RGB) imaging sensor and a custom developed application (‘AppSense 1.0’) for apple fruit sunburn prediction. This tool is configured to acquire and analyze imagery data onboard the smartphone to estimate FST. The tool also utilizes geolocation-specific weather data to estimate weather-based FST using an energy balance modeling approach. The ‘AppSense 1.0’ application, developed to work in the Android operating system, allows visual display, annotation and real-time sharing of the imagery, weather data and pertinent FST estimates. The developed tool was evaluated in orchard conditions during the 2019 crop production season on the Gala, Fuji, Red delicious and Honeycrisp apple cultivars. Overall, results showed no significant difference (t110 = 0.51, p = 0.6) between the mobile FST monitoring tool outputs, and ground truth FST data collected using a thermal probe which had accuracy of ±0.4 °C. Upon further refinements, such tool could aid growers in real-time apple fruit sunburn susceptibility prediction and assist in more effective actuation of apple fruit sunburn preventative measures. This tool also has the potential to be customized for in-field monitoring of the heat stressors in some of the sun-exposed perennial and annual specialty crops at produce maturation.
Highlights
Sunburn is a major physiological disorder that adversely affects productivity of fruits and vegetables including apple, grapes, pepper, pumpkin and watermelons [1,2,3,4,5]
The mobile fruit surface temperature (FST) monitoring tool performed reliably in field conditions to estimate FSTs of the four most common apple cultivars grown in the state of Washington
The mobile FST monitoring tool measured maximum FST was consistent with ground truth measurements
Summary
Sunburn is a major physiological disorder that adversely affects productivity of fruits and vegetables including apple, grapes, pepper, pumpkin and watermelons [1,2,3,4,5]. Sunburn browning and photo-oxidative sunburn are the three major sunburn types [4,5]. Sunburn browning occurs at a slightly lower FST, i.e., between 46 and 49 ◦ C, whereas the photo oxidative sunburn occurs at a much lower FST because of PAR and light shocks to sudden sun-exposure of shaded apple due to management practices such as hand thinning, selective picking or pruning operations [2,3,4,5,6,7,8,9]. Apart from sunburn, FST influences several physiological and biological processes in fruit such as flavor and nutritional values, sugar and acid content, ripening process, fruit quality, size, appearance, and insect/pest infestation susceptibility
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