Comportamiento fenológico y productivo de nogales ( Juglans regia ) variedad Chandler en la Comarca Andina del Paralelo 42

Abstract

This paper seeks to provide information on phenology, fruit quality and incidence of Cydia pomonella (“Carpocapsa”) in Juglans regia (walnut) of the variety Chandler in a crop of the Andean Region of Parallel 42 (CAP 42). This one was chosen variety because of the limited information available for CAP42, as it is the most cultivated in the last years worldwide and in the region, for its smaller size that facilitates the harvest, its lateral branching that increases its productivity, its high yield at Shelling, its marked commercial quality and the potential compatibility with El Hoyo weather conditions. It is a crop with strong cultural roots, started with specimens obtained from seed and that in recent years has been turning towards the use of grafted varieties, mainly Chandler. This variety was chosen for its outstanding characteristics such as the quality of the pulp and its toasts of lateral fruiting that allow greater performance. The Cydia incidence study pomonella was made on 10 trees of the Chandler variety during an annual cycle 2017-2018, in a productive establishment in El Hoyo. A total was taken as a sample of 1000 random nuts. The study of phenology and fruit quality was carried out on 3 of previously selected trees taking a sample of 30 fruits per tree. He observed the phenological development of the variety and its coincidence with the occurrence of frost The female flowering (from Ef to Gf) occurred 4 days after the last frost of the same year, without harming the development of the fruit set. Quality aspects of the Average peeled nut such as weight (5g), diameter (H = 42.9mm), yield at shelled (45.3%) and color (60% light walnuts). Depending on the diameter, they enter the “giant” nut category, however, all values ​​are somewhat lower than bibliographic, possibly due to differences in the duration of the crop cycle and / or of driving. The incidence of Cydia pomonella (0.6% of affected fruits) was studied and dismissed for the parallel implementation of a granulovirus treatment against such plague.