Abstract. Detecting immature green citrus at an early stage for yield forecasting can help growers expect how many fruit they can harvest at the end of the year. Also, it can provide an in-field spatial variability of fruit that can be used for providing site-specific management of citrus trees to increase yield and profit. Yield forecasting using the machine vision technology has been a promis...

A field experiment was conducted to determine effects of concentration and spray volume of metsulfuron-methyl as an abscission aid for mechanical harvesting of citrus. Concentrations of 1, 2, and 4 mg·L metsulfuron-methyl were applied to ‘Hamlin’ orange [Citrus sinensis (L.) Osbeck] trees at 470, 1900, and 4700 L·ha (0.5 to 19 g·ha a.i.). Effective fruit loosening was achieved with all applicat...

In this paper, a cooperative visual servo controller is presented for autonomous citrus harvesting. A fixed camera provides a global view of a tree canopy for the camera-in-hand, attached to the end-effector, to servo to a target fruit. The paper focuses on the development of a robust, image-based, nonlinear visual servo controller to regulate the end-effector to the fruit location in the prese...

This study aimed to evaluate the effect of system-acquired resistance inducing compounds applied during pre-harvest ‘Navelina’ orange and ‘Ortanique’ tangor in controlling post-harvest disease caused by Penicillium digitatum. The products were acibenzolar-s-methyl (ASM), imidacloprid (IMI), methyl jasmonate (MeJa), sodium selenite, potassium silicate, thiamethoxam (TMT). Sterile distilled water...

Darjeeling mandarin (Citrus reticulata Blanco) is one of the most popular fruit crops and Kalimpong districts West Bengal, India. The cultivation crop significantly affected by attack Chinese citrus fly Bactrocera (Tetradacus) minax (Enderlein) (Diptera: Tephritidae). Survey was conducted in months November December 2017 2018 to find out dimension problem along with its distribution, detection ...

We determined if winter drought stress could delay flowering and fruit development of immature ‘Valencia’ sweet oranges to avoid young fruit loss during late-season mechanical harvesting. Beginning in December over three consecutive seasons (2007–2009), Tyvek water-resistive barrier material was used as a rain shield groundcover under 13to 15-year-old trees. There were three treatments: 1) drou...

Chl, the central player in harvesting light energy for photosynthesis, is enzymatically degraded during natural turnover, leaf senescence, fruit ripening or following biotic/abiotic stress induction. The photodynamic properties of Chl and its metabolites call for tight regulation of the catabolic pathway enzymes to avoid accumulation of intermediate breakdown products. Chlorophyllase, the Chl d...