Age Distribution of Cotton Bolls and Damage from the Boll Weevil13

Walker, J. K.; Gannaway, J. R.; Niles, G. A.

doi:10.1093/jee/70.1.5

Cited by 10 publications

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“…Maçãs com dois dias foram as preferidas pelo bicudo, com redução dos danos de 23,53% e 78,43% em relação às de 8 e 12 dias, respectivamente. Estes resultados confirmam dados anteriores, nos quais a suscetibilidade ao dano decresce com o aumento da idade da maçã, o que está diretamente relacionado ao aumento do tamanho e resistência dos tecidos do exocarpo da maçã à penetração do aparelho bucal do inseto (Walker et al, 1977).…”

Section: Resultsunclassified

“…Estes resultados corroboram os obtidos por Walker et al (1977) e Baldwin (1984), que afirmaram ser as maçãs com 12 ou mais dias (>26 mm de diâme-tro) menos suscetíveis a danos causados pelo bicudo, em relação às maçãs mais novas. Walker et al (1977) revelaram que maçãs com 1 a 3 dias e com 11 a 13 dias apresentam probabilidade de 60% e 20%, respectivamente, de sofrerem danos pelo bicudo.…”

Section: Resultsunclassified

“…Segundo Walker (1986), a frutificação mais rápida submeteria os botões florais, flores e maçãs a um menor tempo de exposição ao bicudo. Assim, os dados obtidos por Walker et al (1977) indicaram que maçãs com 12 dias ou mais, são menos suscetíveis a danos do bicudo que as maçãs mais novas, em virtude de sua maior rigidez.…”

Section: Introductionunclassified

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Preferência alimentar do bicudo-do-algodoeiro por frutos de diferentes cultivares e idades

Busoli¹,

Pereira²,

López³

et al. 2004

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar a preferência alimentar de adultos do bicudo-do-algodoeiro, Anthonomus grandis Boheman, 1843 (Coleoptera: Curculionidae), por duas cultivares de algodão (Gossypium hirsutum L.) com frutos de diferentes idades. Foram realizados quatro experimentos em laboratório, avaliando-se o número de orifícios de alimentação. Maçãs de 2, 8 e 12 dias de idade, das cultivares IAC-20 e Reba P288, foram oferecidas aos insetos, confinados em recipientes, com opção de escolha quanto à idade e cultivar (primeiro experimento), sem opção de escolha quanto à idade e cultivar (segundo experimento), sem opção de escolha quanto à cultivar e com opção quanto a idade (terceiro experimento) e sem opção quanto à idade e com opção de escolha quanto à cultivar (quarto experimento). Observou-se preferência por maçãs da cultivar IAC-20 com dois dias de idade, com uma redução de danos de 23,53% e 78,43%, respectivamente, aos oito e aos doze dias de idade.Termos para indexação: Anthonomus grandis, Gossypium hirsutum, pragas de plantas, dano, algodão. Boll weevil feeding preference for fruits of cotton cultivars at different agesAbstract -The objective of this work was to assess the boll weevil, Anthonomus grandis Boheman, 1843 (Coleoptera: Curculionidae) feeding preference for fruits of two cotton cultivars at different ages. The number of feeding holes was assessed in four laboratory experiments. Cotton bolls from cultivars IAC-20 and Reba P288, at the age of 2, 8 and 12 days were offered to the insects, confined in recipients, with (first experiment) and without (second experiment) possibilities of choice both age and cultivar; without possibilities of choice concerning cultivar and with possibilities of choice concerning age (third experiment); without possibility of choice concerning age and with possibility of choice concerning cultivar (fourth experiment). Boll weevil showed preference for the fruits of IAC-20 cultivar. Insect fed more frequently on fruits at the age of two days, with damage reduction of 23.53% and 78.43% on fruits at the age of 8 and 12 days, respectively.

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Section: Resultsunclassified

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Preferência alimentar do bicudo-do-algodoeiro por frutos de diferentes cultivares e idades

Busoli¹,

Pereira²,

López³

et al. 2004

Pesq. agropec. bras.

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“…Tingle et al (1971) observed that when only bolls are available for feeding or if there is a shortage of squares, boll weevils store body fat and the reproductive organs tend to atrophy. Bolls 1Ð3 d old had a 60% probability of being damaged, whereas bolls 11Ð13 d old had about a 20% probability of being damaged (Walker et al 1977).…”

Section: Discussionmentioning

confidence: 95%

Influence of Different Cotton Fruit Sizes on Boll Weevil (Coleoptera: Curculionidae) Oviposition and Survival to Adulthood

Greenberg¹,

Sappington²,

Sétamou

et al. 2004

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Understanding the critical host plant factors that determine oviposition behavior and survival of boll weevil, Anthonomus grandis grandis Boheman, on cotton, Gossypium hirsutum L., is important for developing successful pest management strategies. However, published information is both conflicting and limited regarding how different cotton fruit sizes affect boll weevil oviposition choices and subsequent larval survival to adulthood. Consequently, we used a standard based on fruit size diameter to evaluate boll weevil feeding and oviposition punctures, and survival to adulthood on 10 different cotton fruit sizes: squares of diameter 1.5-2.0 (pinhead), 3.0-3.5 (matchhead), 5-6, 7-8, or 9-10 mm; candle; and bolls of diameter 10-15, 15-20, 20-30, or >30 mm. Oviposition and feeding punctures were significantly affected by cotton fruit size. Females did not oviposit in pinhead squares. The fewest eggs were oviposited in boll sizes >30 mm. The highest number of eggs was recorded in square sizes of 5-6 and 7-8 mm. Boll weevil survival to adulthood was highest on square sizes of 7-8 or 9-10 mm (58.6-59.7%). No survival occurred in matchhead squares or bolls >30 mm. Duration of development was longest on boll sizes of 15-20 and 20-30 mm (18.2-18.8 d). The growth index (percentage immature survival divided by immature developmental time) of female boll weevils was 2.8-fold higher in 7-8-or 9-10-mm diameter squares than in 20-30-mm diameter bolls. This study will improve our capacity to develop methods to predict fruit losses and changes in boll weevil populations in the field, given a starting density of fruit suitable for oviposition, and a corresponding initial population density of weevils. KeywordsAnthonomus grandis grandis, boll weevil, cotton fruit sizes, feeding punctures, oviposition punctures RightsWorks produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.This article is available at Iowa State University Digital Repository: http://lib.dr.iastate.edu/ent_pubs/242BioOne sees sustainable scholarly publishing as an inherently collaborative enterprise connecting authors, nonprofit publishers, academic institutions, research libraries, and research funders in the common goal of maximizing access to critical research. ABSTRACT Understanding the critical host plant factors that determine oviposition behavior and survival of boll weevil, Anthonomus grandis grandis Boheman, on cotton, Gossypium hirsutum L., is important for developing successful pest management strategies. However, published information is both conßicting and limited regarding how different cotton fruit sizes affect boll weevil oviposition choices and subsequent larval survival to adulthood. Consequently, we used a standard based on fruit size diameter to evaluate boll weevil feeding and oviposition punctures, and survival to adulthood on 10 different cotton fruit sizes: squares of diameter 1.5Ð2.0 (pinhead), 3.0 Ð3.5 (matchhead), 5Ð 6,...

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“…Although feeding and oviposition punctures were abundant on bolls, bolls are less vulnerable to boll weevil attack because even if one carpal is infested, the others can still produce lint (Walker et al 1977;A.T.S., unpublished data) and because large bolls, often older and more difÞcult to penetrate than small bolls, are less preferred for oviposition than smaller the bolls (Baldwin et al 1984, Greenberg et al 2004. Also, pesticide application after cut-out (Guinn 1986, Cothren 1999, when squares are no longer initiated by the plant and bolls become the predominant fruiting stage, fails to suppress boll weevil infestations, whereas reproduction is accelerated (Showler 2004b).…”

Section: Discussionmentioning

confidence: 99%

Proactive Spraying Against Boll Weevils (Coleoptera: Curculionidae) Reduces Insecticide Applications and Increases Cotton Yield and Economic Return

Showler

Robinson

2005

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The current standard practice of two to three preemptive insecticide applications at the start of pinhead (1-2-mm-diameter) squaring followed by threshold-triggered (whenever 10% of randomly selected squares have oviposition punctures) insecticide applications for boll weevil, Anthonomus grandis grandis Boheman, control does not provide a reliably positive impact on cotton, Gossypium hirsutum L., yields in subtropical conditions. This study showed that four fewer spray applications in a "proactive" approach, where spraying began at the start of large (5.5- 8-mm-diameter) square formation and continued at 7- to 8-d intervals while large squares were abundant, resulted in fewer infested squares and 46-56% more yield than the standard treatment at two locations during 2004. The combination of fewer sprays and increased yield made the proactive approach 115-130% more profitable than the standard. The proactive approach entails protection only at the crop's most vulnerable stage (large squares) that, as a source of food, accelerates boll weevil reproduction. In contrast, the standard approach protects early season small squares and later season bolls, both of which contribute less to boll weevil reproduction than large squares. Proaction is an in-season crop protection approach that can be used to increase yield in individual fields during the same season and that could be incorporated into boll weevil eradication strategy that involves later diapause sprays. Because proaction is based on an important relationship between the cotton plant and boll weevil reproduction, the tactic will probably be effective regardless of climate or region.

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Age Distribution of Cotton Bolls and Damage from the Boll Weevil13

Cited by 10 publications

References 0 publications

Preferência alimentar do bicudo-do-algodoeiro por frutos de diferentes cultivares e idades

Preferência alimentar do bicudo-do-algodoeiro por frutos de diferentes cultivares e idades

Influence of Different Cotton Fruit Sizes on Boll Weevil (Coleoptera: Curculionidae) Oviposition and Survival to Adulthood

Proactive Spraying Against Boll Weevils (Coleoptera: Curculionidae) Reduces Insecticide Applications and Increases Cotton Yield and Economic Return

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