Cotton Stainers and Their Relatives (Pyrrhocoroidea

Ahmad, İmtiaz; Schaefer, Carl W.

doi:10.1201/9781420041859.ch8

Cited by 2 publications

(1 citation statement)

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“…Phytophagous stink bugs prefer to feed on immature fruits, as penetration by their rostrum and feeding may be easier, and these fruits provide better nutrition (Esquivel 2011, Medrano et al 2011. The bugs of the genus Dysdercus cause injury to cotton plants with open fruits (bolls), and they feed on the maturing cotton seeds within these bolls (Schaefer 1998, Ahmad & Schaefer 2000, Gallo et al 2002, causing discoloration of fibers due to defecation while feeding. In the present study, this phenomenon was not observed for E. heros that infested mature plants with open bolls.…”

Section: Discussionmentioning

confidence: 99%

Economic Injury Level of the Neotropical Brown Stink Bug Euschistus heros (F.) on Cotton Plants

et al. 2016

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In Brazil, the Neotropical brown stink bug, Euschistus heros (F.) (Hemiptera: Pentatomidae), commonly disperses from soybeans to cotton fields. The establishment of an economic treatment threshold for this pest on cotton crops is required. Infestation levels of adults of E. heros were evaluated on cotton plants at preflowering, early flowering, boll filling, and full maturity by assessing external and internal symptoms of injury on bolls, seed cotton/lint production, and fiber quality parameters. A completely randomized experiment was designed to infest cotton plants in a greenhouse with 0, 2, 4, 6, and 8 bugs/plant, except at the full-maturity stage in which only infestation with 8 bugs/plant and uninfested plants were evaluated. Results indicated that the preflowering, early-flowering, and full-maturity stages were not affected by E. heros. A linear regression model showed a significant increase in the number of internal punctures and warts in the boll-filling stage as the population of bugs increased. The average number of loci with mottled immature fibers was significantly higher at 4, 6, and 8 bugs compared with uninfested plants with data following a quadratic regression model. The seed and lint cotton was reduced by 18 and 25% at the maximum level of infestation (ca. 8 bugs/plant) in the boll-filling stage. The micronaire and yellowing indexes were, respectively, reduced and increased with the increase of the infestation levels. The economic injury level of E. heros on cotton plants at the boll-filling stage was determined as 0.5 adult/plant. Based on that, a treatment threshold of 0.1 adult/plant can be recommended to avoid economic losses.

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Section: Discussionmentioning

confidence: 99%