Vegetative Growth Responses of Pinot gris (Vitis vinifera L.) Grapevines to Infestation by Potato Leafhoppers (Empoasca fabae Harris)

摘要: The potato leafhopper (Empoasca fabae Harris) can be a damaging pest of vineyards throughout eastern North America, causing leaf curling and yellowing in sensitive cultivars. To determine the relationship between infestations by this insect vine growth resource allocation, potted fruitless Pinot gris (Vitis vinifera L.) grapevines grafted to rootstock 1103 Paulsen (V. berlandieri Planch. x V. rupestris Scheele) were infested for 7 days with 0.0 4.5 (E. fabae) nymphs per leaf. Shoot growth, infestation symptoms leaves quantified before after period, biomass vegetative structures was measured at end experiment. Leaf cupping discoloration positively correlated severity, while shoot declined increasing density. Root mass experiment lower vines higher levels. Analysis these results enabled damage symptom thresholds determined 0.5 1.0 E. However, recovery observed parameters, reduced only when densities exceeded 3.0 This study reveals negative effect low on grape cultivar suggests that recover from levels during postinfestation period.