Factors influencing the performance of phosphites on the control of coffee leaf rust

IF 1.2 4区 农林科学 Q2 AGRICULTURE, MULTIDISCIPLINARY
J. Honorato Júnior, D. Debona, L. Zambolim, F. Rodrigues
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Abstract

This study investigated the effect of different phosphites on the control of coffee leaf rust (CLR) caused by Hemileia vastatrix, considered the major disease affecting coffee yield worldwide. Three-month-old coffee plants were sprayed with two doses each of the phosphite solutions (standard and double), as follows: K (40% P2O5; 1.5 and 3 mL·L -1), K (30% P2O5; 3 and 6 mL·L -1), Cu (2.5 and 5 mL·L1), Mn+Zn (3 and 6 mL·L-1) and Na (3 and 6 mL·L-1) 24 h before being inoculated with H. vastatrix. Leaves were not washed or washed with deionized water after the foliar phosphites spray. Plants sprayed with water served as the control treatment. Inoculation was performed on the abaxial side of the first pair of expanded leaves using a camel hairbrush with a suspension of urediniospores (1 mg per leaf). All phosphites applied at the standard doses (from 1.5 to 3 mL·L-1) reduced the total number of pustules (TNP) per leaf by 28-69% regardless of washing treatment. The biggest reductions were observed for Cu phosphite, which decreased the TNP per leaf by 60 and 69% without and with leaf washing, respectively. A similar trend was observed when the double doses of phosphites (from 3 to 6 mL·L-1) were used, though Na phosphite without leaf washing and Mn/Zn phosphite without and with leaf washing were not efficient to reduce the TNP per leaf. Without leaf washing, only Cu and Na phosphites decreased CLR severity at the standard doses (53-61%), whereas all phosphites, except the Mn/ Zn phosphite, reduced CLR severity at the double dose. The CLR severity was decreased using K 30%, K 40% and Cu phosphites when applied at the standard doses with leaf washing (41-59%). With double doses, only Cu and Na phosphites decreased CLR severity by 55% for both treatments. In conclusion, the efficiency of the phosphites for CLR control varied according to the accompanying cation, dose and washing conditions. The Cu phosphite resulted in the best CLR control regardless of the dose used and the washing conditions.
亚磷酸盐防治咖啡叶锈病效果的影响因素
研究了不同亚磷酸盐对咖啡叶锈病的防治效果,该病害是影响咖啡产量的主要病害。三个月大的咖啡树分别喷洒两种剂量的亚硝酸盐溶液(标准和双倍),如下:K (40% P2O5;1.5和3ml·L -1), K (30% P2O5;3和6 mL·L-1), Cu(2.5和5 mL·L-1), Mn+Zn(3和6 mL·L-1)和Na(3和6 mL·L-1)接种前24 h。叶片喷施亚磷酸酯后不洗或用去离子水洗。植物喷水作为对照处理。接种在第一对膨大叶片的背面,使用骆驼毛刷与尿素孢子悬浮液(每片1 mg)进行接种。在标准剂量(1.5 ~ 3 mL·L-1)下施用的所有亚磷酸盐,无论洗涤处理如何,每片叶子的脓疱总数(TNP)减少了28-69%。亚磷酸铜处理的叶片TNP降低幅度最大,不洗叶和洗叶处理的叶片TNP分别降低60%和69%。2次亚磷酸酯(3 ~ 6 mL·L-1)处理也有类似的效果,但不洗叶的亚磷酸酯钠和不洗叶和有洗叶的亚磷酸酯锰锌均不能有效降低叶片TNP。在不洗叶的情况下,在标准剂量下,只有Cu和Na亚硝酸盐降低了CLR的严重程度(53-61%),而在双剂量下,除Mn/ Zn亚硝酸盐外,所有亚硝酸盐都降低了CLR的严重程度。在洗叶的标准剂量下,30%、40%的钾和40%的亚磷酸铜降低了CLR的严重程度(41% -59%)。在双剂量的情况下,两种治疗中只有Cu和Na降低了55%的CLR严重程度。综上所述,亚磷酸盐对CLR的控制效果因其所伴随的阳离子、剂量和洗涤条件而异。无论使用的剂量和洗涤条件如何,亚硫酸铜的CLR控制效果最好。
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来源期刊
Bragantia
Bragantia AGRICULTURE, MULTIDISCIPLINARY-
CiteScore
2.40
自引率
8.30%
发文量
33
审稿时长
4 weeks
期刊介绍: Bragantia é uma revista de ciências agronômicas editada pelo Instituto Agronômico da Agência Paulista de Tecnologia dos Agronegócios, da Secretaria de Agricultura e Abastecimento do Estado de São Paulo, com o objetivo de publicar trabalhos científicos originais que contribuam para o desenvolvimento das ciências agronômicas. A revista é publicada desde 1941, tornando-se semestral em 1984, quadrimestral em 2001 e trimestral em 2005. É filiada à Associação Brasileira de Editores Científicos (ABEC).
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