Pinot Leaf Curl - UC Cooperative Extension Viticulture Farm Advisors - 病害信息解读

Aug 27, 2026

Pinot leaf curl (PLC) is a nitrogen-related disorder in grapevines observed in spring, especially in Pinot noir, Pinot blanc, and Pinot Meunier. Low temperatures in early season followed by short sharp temperature drops are associated with symptom onset through bloom, including effects from coastal marine layers and radiational cooling. PLC does not occur in every Pinot vineyard and can be mild or severe, with symptoms ranging from stunted shoots and orphaned clusters to necrosis, leaf abscission, and variable crop loss. Fungicides are not effective because the disorder is not Botrytis shoot blight.

LanguageEnglish

CategoryHealthcare

FormatPDF

Pages5

Reading Time13 min

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Pinot leaf curl概述

发生时间与气候关联

症状进展与田间表现

与Botrytis shoot blight的区别

防治建议与误区

Pinot Leaf Curl Rhonda J. Smith and Larry J. Bettiga UC Cooperative Extension Viticulture Farm Advisors, Sonoma and Monterey Counties; and Douglas O.Adams, Department of Viticulture and Enology, UC Davis In 2015, low temperatures occurred in the second week of April and symptoms known as Pinot leaf curl appeared in Pinot cultivars across many grape growing regions. Symptoms were seen in coastal and northern interior wine grape growing regions. Pinot leaf curl (PLC) is a nitrogen-related disorder that has been observed in the spring in primarily Pinot noir, Pinot blanc and Pinot Meunier grapevines. The cause of PLC is not fully understood. This article is meant to inform growers, and pest control advisers ofthe wide range of symptoms that may occur in Pinot cultivars affected by the disorder. The onset of PLC is associated with prolonged periods oflow temperatures and brief episodes of sudden temperature depression at the beginning of the growing season through bloom. Periods of relatively low temperatures caused by consistent daily on-shore air movement in coastal regions can usher in a thick marine layer depressing daytime maximum temperatures. Radiational cooling under clear skies – that may or may not result in a frost event-have also been associated with an increase in incidence of PLC. Studies to quantify the relationship between the onset and severity of symptoms of PLC to temperature thresholds or the duration of hours within a range of temperatures have not been conducted. Pinot leaf curl does not occur in all Pinot vineyards but in others it is chronic under “normal” spring temperatures. In most years, the symptoms are primarily mild leaf curling. The incidence of the disorder varies by clone within Pinot noir but not consistently between years. Symptoms of PLC usually develop prior to bloom; however in 2015, continued cool temperatures in the Figure 1 Figure 1: Stunted shoot on Pinot noir vine with small leaves that are dying. north coast resulted in sustained and in some cases the reoccurrence of symptoms in vines that had initial onset in April. Symptom progression Symptoms occur in expanding blades and in other rapidly growing tissue, thus timing of symptom onset as well as the length of time that conditions are conducive determines severity and degree of crop loss. Low temperatures for three or more weeks during and following bud break often impacts shoot and cluster development resulting in severely stunted shoots (Figure 1). In some vines,“orphaned clusters”may occur on nodes when the shoot tip dies shortly after growth begins and leaves fail to develop or die, thus only the cluster remains (Figure 2). Shelling – flower loss before or during bloom – is common. If conditions conducive to PLC occur after the basal region of the shoot has finished elongating and leaves on nodes with clusters have fully expanded, then clusters are less likely to be affected if temperatures drop for only a few days. In that case, leaves distal to the clusters will be impacted and the severity is variable. A downward curling of the leaf blades consistently occurs – as described by the name of the disorder – and is considered a mild form of PLC (Figure 3). The undersides of such blades have a necrotic area on a main vein at which point the blade curls or folds downward (Figure 4). If low temperatures persist 48 CAPCA ADVISER | AUGUST 2015 Figure 2 Figure 3 Figure 2: The shoot has been reduced to a single cluster in Pinot noir after the shoot tip has died (seen above necrotic area on cluster stem). then symptom severity increases. Initially, petioles become necrotic followed by blades then leaf abscission occurs. Leaf loss can occur on one to several nodes distal to the clusters. Older leaves that are nearly fully expanded as well as small blades that just separated from the growing tip can be killed. From a distance, affected shoots appear tobe stripped of leaves above the proximal (top) cluster (

FAQs

Pinot leaf curl（PLC）主要发生在什么时候、哪些葡萄品种上？

PLC在生长季春季出现，常见于Pinot noir、Pinot blanc和Pinot Meunier。文章指出2015年在4月第二周开始出现，并在沿海及北部内陆葡萄产区被观察到。

PLC的发生与温度条件有哪些关系？

PLC的起病与持续低温以及生长季开始到开花期的短时降温事件有关。沿海地区由稳定的海风带来的较低日最高温，以及晴朗天空下的辐射冷却都被提及与发病增加有关。

为什么文章不建议用杀菌剂来处理PLC？

文章指出一些人把节点处的坏死误认为是Botrytis shoot blight。Botrytis需要温暖潮湿并依赖游离水，而PLC由低温影响特定品种出现；Botrytis cinerea主要在坏死组织上定殖，但并不造成节点坏死，因此杀菌剂不能降低PLC发生或严重度。

Aug 27, 2026

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