Grape leafhopper

The grape leafhopper (Erythroneura plena) is a member of the Cicadellidae family within the order Hemiptera. It is recognized as a significant pest in viticulture, known for its ability to quickly colonize vineyards and cause physiological stress to grapevines through its feeding habits.

The primary host plant for this insect is the grapevine (Vitis vinifera). The pest is particularly problematic in warmer viticultural regions, where favorable environmental conditions allow the leafhopper to complete multiple life cycles rapidly throughout the growing season.

The biology of Erythroneura plena involves a cycle of overwintering as adults in leaf litter or debris at the base of vines. As temperatures rise in spring, the adults migrate to newly developed foliage. Throughout the summer, multiple generations of nymphs and adults feed on the undersides of leaves, piercing plant tissues and extracting cell contents.

Damage caused by this leafhopper is manifested by stippling, where the leaves develop pale or yellow necrotic spots. In cases of high infestation, this damage leads to widespread chlorosis, reduced photosynthetic activity, and premature leaf drop. These impacts ultimately lower fruit quality, decrease sugar content, and reduce the vine's ability to store reserves for the next year.

Effective management strategies for Erythroneura plena include:

• Cultural practices such as removing leaf litter and weeds to eliminate overwintering sites.
• Regular canopy management to improve airflow and expose nymphs to predators.
• Targeted applications of insecticides during early nymphal stages when populations are most vulnerable.
• Promoting natural biological control by conserving beneficial predator populations, such as spiders and parasitic wasps.