Damage Patterns caused by Lygocoris spinolae (Hemiptera: Miridae) on 'Campbell Early'Grapes

• Published in: Journal of Asia-Pacific entomology 2000, Vol.3 (2), p.95-101
• Main Authors: Kim, Dong-Soon, Cho, Myoung-Rae, Jeon, Heung-Young, Yiem, Myong-Soon, Lee, Joon-Ho, Na, Seung-Yong, Lee, Jeang-Oon
• Format: Article
• Language: Korean
• ISSN: 1226-8615; 1876-7990

The phonology and damage patterns of Lygocoris spinolae (Meyer-Dur) on 'Campbell Early'grape were examined in different grape development stage of inflorescence formation, blooming, and berry set. Nymphs fed on newly unfolding leaves of shoot tip before inflorescence formation. As the inflorescences were clearly visib1e, nymphs on loaves moved to flower clusters. Sting spots with brown color occurred at sucking sites of leaves, then expanded to hole as the leaves developed, and resulted in leaf malformation. The nymphs on flower clusters sucked developing florets, which induced the drying of florets followed by defoliation. After flower caps had fallen, L. spinoiae fed en young berries causing blackening of berry skin around the sting. The blackening of berry skin changed to corky-scarred tissue as the berry developed.L. spinolae feeding significantly reduced the number of berries per cluster in all grape stages. A few berries became corky-scarred of shot berries when fed at inflorescence formation period. Feeding at blooming caused shot berries with low rate of corky-scarred berry Most of the berries were corky-scarred or became shot berries when fed at berry set. Feeding by adults caused the same damage patterns as nymphs. Heavy damages were observed where L. spinolae were introduced after inflorescence formation: reduced number of bellies per cluster by 35.0 to 99.1% at blooming and by 80.0% at berry setting depending on 1. spinoiae densities.