Interaction of Genetically Engineered Host Plant Resistance and Natural Enemies of Heliothis virescens (Lepidoptera: Noctuidae) in Tobacco

1992 ◽  
Vol 21 (3) ◽  
pp. 586-597 ◽  
Author(s):  
M. Tracy Johnson ◽  
Fred Gould
Keyword(s):  
Host Plant ◽  
Natural Enemies ◽  
Plant Resistance ◽  
Host Plant Resistance ◽  
Heliothis Virescens ◽  
Genetically Engineered ◽  
Lepidoptera Noctuidae

scholarly journals Screening Newly Developed Bermudagrasses for Host Plant Resistance against Fall Armyworm (Lepidoptera: Noctuidae)

HortScience ◽  
2020 ◽  
Vol 55 (11) ◽  
pp. 1811-1816
Author(s):  
Gurjit Singh ◽  
Shimat V. Joseph ◽  
Brian Schwartz
Keyword(s):  
Host Plant ◽  
Plant Resistance ◽  
Spodoptera Frugiperda ◽  
Host Plant Resistance ◽  
Warm Season ◽  
Fall Armyworm ◽  
Adult Emergence ◽  
Underlying Mechanism ◽  
Head Capsule ◽  
Lepidoptera Noctuidae

The fall armyworm, Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae), is an important pest of warm-season turfgrass species, including bermudagrass (Cynodon spp.). Bermudagrass is a popular turfgrass that is widely planted on golf courses, athletic grounds, and ornamental landscapes across the country and throughout the world. Spodoptera frugiperda infestation is often sporadic; however, when it does occur, damage can be severe. Host plant resistance against S. frugiperda can be a valuable tool for reducing or preventing the use of insecticides. Therefore, the objective of this study was to determine resistance against S. frugiperda in a few promising bermudagrasses. Fourteen experimental bermudagrass genotypes plus two control cultivars, ‘Zeon’ zoysiagrass (resistant control) and ‘TifTuf’ bermudagrass (susceptible control), were evaluated against S. frugiperda to determine host plant resistance in the laboratory. The results showed that the resistant control, ‘Zeon’ zoysiagrass, was more resistant than the other genotypes to S. frugiperda larvae. To determine the response of the experimental lines to S. frugiperda as compared with that of the controls, three indices were developed based on survival, development, and overall susceptibility. According to the susceptibility index, ‘13-T-1032’, ‘T-822’, ‘11-T-510’, ‘12-T-192’, ‘11-T-56’, ‘09-T-31’, ‘11-T-483’, and ‘13-T-1067’ were the top-ranked bermudagrasses. Among these, the responses of ‘13-T-1032’, ‘T-822’, ‘11-T-510’, ‘11-T-56’, ‘09-T-31’, and ‘11-T-483’ were comparable to that of ‘TifTuf’, and antibiosis was the underlying mechanism of resistance. Additionally, larval length, head capsule width, and weight were negatively associated with the days of pupation and adult emergence and positively associated with pupal length, thorax width, and weight. These results will help refine future breeding and with investigations of resistance against the fall armyworm.

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