Drepanothrips

Systematic position. Drepanothrips is a genus belonging to the order Thysanoptera and the family Thripidae. The most significant species within this genus is Drepanothrips reuteri, which is widely recognized as a specialized pest affecting viticulture and several fruit-bearing tree species.

Affected crops and economic impact. Grapevines are the primary host for this pest. The insects feed by piercing the plant tissue and sucking the cell sap, primarily targeting young leaves, shoots, and developing flower clusters. This feeding activity leads to significant physiological stress in the plant, resulting in reduced yields and decreased overall plant vigor.

Biology and lifecycle. Adults and larvae overwinter in sheltered areas such as bark crevices or beneath fallen debris. As spring temperatures rise, the insects emerge to begin their feeding and reproductive cycle. Depending on environmental conditions, particularly heat and humidity, the pest can produce multiple generations during a single growing season.

Damage patterns. Feeding sites often show signs of necrosis, leading to discoloration, wilting, and curling of leaves. On young shoots, the damage results in stunted and twisted growth. The infestation of floral tissues is particularly damaging, as it often causes flower drop and results in distorted or small grape clusters, directly impacting harvest volume.

Management practices. Effective control of Drepanothrips requires a combination of integrated pest management (IPM) strategies:

• Elimination of overwintering sites by removing plant debris and weeds.
• Application of selective systemic insecticides during peak infestation periods.
• Regular monitoring using sticky traps to detect early population spikes.
• Enhancing plant health through proper irrigation and balanced fertilization programs.