Fecha/hora: 01/06/2024 07:44:44

Biblioteca(s): 	INIA Las Brujas.	
Fecha corriente: 	26/01/2024	
Fecha de la última actualización: 	26/01/2024	
Autoria: 	GONZALEZ NIETO, L.; FRANCESCATTO, P.; CARRA, B.; ROBINSON, T.L.	
Afiliación: 	LUIS GONZALEZ NIETO, Horticulture Section, School of Integrative Plant Science, Cornell University, Geneva, 14456, NY, United States; POLIANA FRANCESCATTO, Valent BioSciences, Libertyville, 60048, IL, United States; BRUNO CARRA, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; TERENCE LEE ROBINSON, Horticulture Section, School of Integrative Plant Science, Cornell University, Geneva, 14456, NY, United States.	
Título: 	Metamitron thinning efficacy of apple fruitlets is affected by different rates, timings and weather factors in New York State.	
Año de publicación: 	2023	
Fuente/Imprenta: 	Horticulturae, 2023, Volume 9, Issue 11, article 1179. https://doi.org/10.3390/horticulturae9111179  -- OPEN ACCESS.	
ISSN: 	2311-7524	
DOI: 	10.3390/horticulturae9111179	
Idioma: 	Inglés	
Notas: 	Article history: Submission received: 6 October 2023, Revised: 24 October 2023, Accepted: 26 October 2023, Published: 28 October 2023. -- Document type: Article Gold Open Access. -- Correspondence: Gonzalez Nieto, L.; Horticulture Section, School of Integrative Plant Science, Cornell University, Geneva, NY, United States; email:lg579@cornell.edu  -- This article belongs to the Collection Precision Management Systems for Sustainable Orchards and Vineyards (https://www.mdpi.com/journal/horticulturae/topical_collections/QAD12207C7 ). -- LICENSE: Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).	
Contenido: 	ABSTRACT.- Precision chemical thinning is the most common method of thinning apple fruitlets because it requires little time and is cost-effective. The aims of the current study were I.- to investigate the effect of the application of metamitron at different rates on 'Gala' apples; II.- to determine which fruit diameters were most sensitive to metamitron spray at several rates (between 180 and 500 ppm); and III- to identify the key environmental factors that explain Metamitron efficacy on a year-to-year basis. Eighteen trials were conducted over seven seasons, from 2015 to 2022 in 'Gala' apple orchards in Geneva (New York State). Metamitron was applied at different rates between 180 and 500 ppm, and the timing of the application was between petal fall (4.5 mm) and 18.5 mm fruit size. In each of the studies and years, the effect of meteorological parameters was evaluated. Our results suggest that a linear rate effect was observed in all trials, but that there were differences between the slopes of the regression every year because chemical thinning efficacy was variable year to year. The maximum metamitron efficacy was between 9.5 and 11 mm king fruit diameter; however, metamitron showed thinning efficacy at all phenological stages, from petal fall to 18.5 mm in 'Gala' apples. Our results suggest that the important meteorological factors affecting thinning efficacy were temperature and solar radiation on the day of application and for the next 6 days. The solar radiation after application of metamitron was the most important meteorological factor. Fruit drop caused by metamitron increased with low solar radiation. The minimum and maximum temperatures were also important factors in determining metamitron efficacy. A high minimum temperature (during the night) increased the fruit drop caused by metamitron and the maximum temperature during the day showed a negative correlation with the efficacy of metamitron. © 2023 by the authors.	
Palabras-Clave: 	Brevis; Maximum temperature; Metamitron; Minimum temperature; SISTEMA VEGETAL INTENSIVO - INIA; Solar radiation; Thinning efficacy.	
Categoría del tema: 	F01 Cultivo	
URL: 	https://www.mdpi.com/2311-7524/9/11/1179/pdf	
Registro original: 	INIA Las Brujas (LB)	
Ejemplares: 	LB - (103784-1) - PXI - AP - DD - PP/Horticulturae/2023 -  -  - DIS