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Fusarium Hardlock Associated With Lygus lineolaris (Hemiptera: Miridae) Injury in Southeastern Cotton.
Dorman, Seth J; Opoku, Joseph; Mehl, Hillary L; Taylor, Sally V.
Afiliação
  • Dorman SJ; Tidewater Agricultural Research and Extension Center, Virginia Tech University, Suffolk, VA 23437.
  • Opoku J; Tidewater Agricultural Research and Extension Center, Virginia Tech University, Suffolk, VA 23437.
  • Mehl HL; Tidewater Agricultural Research and Extension Center, Virginia Tech University, Suffolk, VA 23437.
  • Taylor SV; Tidewater Agricultural Research and Extension Center, Virginia Tech University, Suffolk, VA 23437.
Plant Dis ; 105(1): 53-59, 2021 Jan.
Article em En | MEDLINE | ID: mdl-33197381
The tarnished plant bug, Lygus lineolaris (Palisot de Beauvois), is an important insect pest in cotton that feeds on reproductive fruit, contributing to yield loss. Economically damaging infestations of L. lineolaris have doubled in Virginia since 2013. Escalation of L. lineolaris abundance may increase Fusarium hardlock disease observed in this region, compounding economic losses. Research has linked Fusarium hardlock with fungal species Fusarium verticillioides and F. proliferatum. Field and greenhouse experiments were performed to investigate (i) Fusarium hardlock occurrence in field plots managed and unmanaged for L. lineolaris, (ii) severity of F. verticillioides infection of cotton bolls with and without the presence of L. lineolaris feeding in a greenhouse setting, and (iii) Fusarium species composition and prevalence within field-collected L. lineolaris and cotton lint with and without insect feeding injury and hardlock symptoms present. Nearly twice the amount of hardlock (i.e., proportion of hardlocked locules) occurred in field-collected bolls with L. lineolaris feeding symptoms (0.40 ± 0.02) compared with bolls without (0.21 ± 0.01). Based on real-time quantitative PCR, cotton bolls exposed to F. verticillioides inoculum and caged with L. lineolaris adults had greater levels of F. verticillioides DNA compared with untreated bolls. F. proliferatum, F. verticillioides, and F. fujikuroi were isolated from field-collected L. lineolaris and hardlocked cotton lint at harvest. These findings suggest that the presence of L. lineolaris is associated with an increased risk of Fusarium hardlock in Southeastern cotton, and both should be carefully managed using timely insecticide applications and cultural control practices to minimize yield loss.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Heterópteros / Fusarium / Inseticidas Tipo de estudo: Risk_factors_studies Limite: Animals País/Região como assunto: America do norte Idioma: En Ano de publicação: 2021 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Heterópteros / Fusarium / Inseticidas Tipo de estudo: Risk_factors_studies Limite: Animals País/Região como assunto: America do norte Idioma: En Ano de publicação: 2021 Tipo de documento: Article