Physiological Activity of the Boll Weevil During the Fall and Winter in Subtropical Areas of the Rio Grande Valley of Texas12

Guerra, António; Garcia, R. D.; Tamayo, Juan A.

doi:10.1093/jee/75.1.11

Cited by 30 publications

(30 citation statements)

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“…2003. c of DD would require intimate knowledge of overwintering habitat and insulation, and ambient air temperatures overestimate positive DD by 6.5Ð15.7% (Parajulee et al 1997). Stone et al (1990) reported that, over a 7-yr study, the variation in emergence patterns can be Ͼ30 d. Although Parajulee et al (2001) developed a model for boll weevil survivorship on the Rolling Plains, overwintering habitats, food sources (Chandler and Wright 1991), the timing of weevil entry into overwintering habitat (Sterling 1971, Wade and, the date at which to begin calculating DD (Parajulee et al 1996), and the relative incidence of diapause, among other conceivable parameters, would differ in subtropical and tropical conditions where boll weevils are active and reproducing year-round (Guerra et al 1982).…”

Section: Discussionmentioning

confidence: 99%

“…The Lower Rio Grande Valley is a unique subtropical region of the United States that supports active, reproducing boll weevil populations year-round (Guerra et al 1982, Summy et al 1988). This occurs despite a mandatory host-free period from 1 September until 1 February (Texas Department of Agriculture 2002), for which uniform compliance is not alMention of trade names or commercial products in this publication is solely for the purpose of providing speciÞc information and does not imply recommendation or endorsement by the U.S. Department of Agriculture.…”

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confidence: 99%

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Effects of Planting Dates on Boll Weevils (Coleoptera: Curculionidae) and Cotton Fruit in the Subtropics

Showler¹,

Greenberg²,

Scott³

et al. 2005

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The effects of planting dates 2-3-wk apart on boll weevil, Anthonomus grandis grandis Boheman (Coleoptera: Curculionidae), field-level populations, and feeding and oviposition damage to cotton, Gossypium hirsutum L., squares and bolls, were studied during 2002 and 2003 in the Lower Rio Grande Valley of Texas. Squares were 44-56% more abundant in some later planted treatments than in the earlier planted treatments, but mean cumulative numbers of oviposition- and feeding-damaged squares were 2.7 - 4.8-fold greater in some later planted treatments than in earlier treatments. Increased square production in later planted cotton was offset by boll weevil infestations that occurred when squares are most vulnerable and contribute most toward the pest's reproduction. Early planting avoided boll weevil population buildups in the field when large squares were abundant. Lint yields in 2002 did not differ significantly between the planting date treatments, but in 2003, mean yield in the middle treatment was 23% greater than in the early and late-planted treatments. Insecticide sprays in the earliest planted treatment of each year, based on the 10% damaged squares threshold, were >33% and >43% fewer than in the corresponding middle and latest planting treatments, respectively. Delayed planting, relative to the onset of favorable cotton-growing weather, at the field level, even when not applied uniformly on an areawide scale, is more cost-effective than planting too early or too late.

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Effects of Planting Dates on Boll Weevils (Coleoptera: Curculionidae) and Cotton Fruit in the Subtropics

Showler¹,

Greenberg²,

Scott³

et al. 2005

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“…A similar behavior has also been observed for boll weevils in the temperate and subtropical regions of North America (Showler, 2003(Showler, , 2006. In the tropics and subtropics, males and females go into reproductive dormancy (Spurgeon & Raulston, 2006;Paula et al, 2013), but remain active throughout the year (Guerra et al, 1982;Macêdo et al, 2015) due to alternative foods that can sustain them in the absence of cotton (Hardee et al, 1999;Ribeiro et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Survival pattern of the boll weevil during cotton fallow in Midwestern Brazil

Pires

Pimenta

Mata

et al. 2017

Pesq. agropec. bras.

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-The objective of this work was to determine the survival pattern of the cotton boll weevil during fallow in Midwestern Brazil. The percentage of adults that remained in the cotton reproductive structures, the percentage of adults searching for shelters, and the longevity of adults fed on pollen and nectar as alternative food sources were determined. For this, four populations were sampled in cotton squares and bolls, totaling 11,293 structures, from 2008 to 2012. The emergency of cotton weevil adults was monitored from the collection of the structures until the next cotton season. In the laboratory, newly-emerged adults were fed on hibiscus or Spanish needle, and their life span was monitored individually. Most adults (85.73%) left the reproductive structures, regardless of the cotton plant phenology, up to 49 days after the structures were collected. One individual (0.0002%) from 5,544 adults was found alive after the fallow period. The diet with hibiscus and Spanish needle provided adult longevity of 76±38 days, which was enough time for adults to survive during the fallow period. Most of the boll weevils leave the cotton structures at the end of harvest, survive using alternative food sources, and do not use cotton plant structures as shelter during the legal cotton fallow period in Midwestern Brazil.Index terms: Anthonomus grandis, Gossypium hirsutum, alternative food, cotton bolls. Padrão de sobrevivência do bicudo-do-algodoeiro durante o pousio na região Centro-Oeste do BrasilResumo -O objetivo deste trabalho foi determinar o padrão de sobrevivência do bicudo-do-algodoeiro durante o pousio no Centro-Oeste do Brasil. Foram determinadas as percentagens de adultos das populações que permaneceram nas estruturas reprodutivas do algodoeiro, as percentagens de adultos que saíram para os refúgios, e a longevidade dos adultos alimentados com pólen e néctar como fontes de alimentos alternativos. Para tanto, foram amostradas quatro populações em botões florais e maçãs do algodoeiro, que totalizaram 11.293 estruturas, de 2008 a 2012. A emergência de adultos do bicudo-do-algodoeiro foi monitorada desde a coleta das estruturas até a próxima safra de algodão. Em laboratório, adultos recém-emergidos foram alimentados com hibisco ou picão, e sua longevidade foi monitorada individualmente. A maioria dos adultos (85,73%) saiu das estruturas reprodutivas, independentemente da fenologia do algodoeiro, até 49 dias após as estruturas terem sido coletadas. Um indivíduo (0,0002%) entre 5.544 adultos foi encontrado vivo após o período da entressafra. A dieta de hibisco e picão permitiu uma longevidade de 76±38 dias, tempo suficiente para manter os adultos vivos durante a entressafra. A maioria dos bicudos-de-algodoeiro deixa as estruturas reprodutivas do algodoeiro no final da colheita, sobrevive com alimento alternativo e não usa as estruturas da planta como abrigo durante o período legal de pousio na região Centro-Oeste do Brasil.Termos para indexação: Anthonomus grandis, Gossypium hirsutum, alimento alternativo, maças ...

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“…The number of captured boll weevils per trap decreased during the cotton-free period from September through March (i.e., from postharvest to early spring) by 6.3-fold (from 21. Graham et al (1979) and Guerra et al (1982) also observed that the number of boll weevils captured in traps in the LGRV peaked in September and declined through the onset of spring.…”

Section: Overwintering Boll Weevil Characterizationmentioning

confidence: 94%

“…Basic research designed to address unanswered questions on the seasonal dynamics of boll weevils is vital to successful expansion of eradication, containment, and management programs into subtropical and tropical environments. In the subtropical Lower Rio Grande Valley (LRGV) of Texas, reproduction is halted in diapausing adults, and metabolic activity is suppressed (Wolfenbarger et al 1976, Graham et al 1978, 1979, Guerra et al 1982, Summy et al 1993). In the subtropics and tropics, diapause functions to help the boll weevil survive periods of food shortage while permitting activity during extended periods of relatively mild climatic conditions (Guerra et al 1984, Summy et al 1988.…”

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confidence: 99%

Reproductive Potential of Overwintering, F1, and F2 Female Boll Weevils (Coleoptera: Curculionidae) in the Lower Rio Grande Valley of Texas

Greenberg

Sappington

Sétamou

et al. 2007

Environmental Entomology

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The feeding and oviposition activity of overwintering boll weevils, Anthonomus grandis grandis (Boheman), and seasonal fluctuations in development, survival, and reproduction of progeny of overwintering and firstand second-generation boll weevil females were determined in the laboratory at 27°C, 65% RH, and a photoperiod of 12:12 (L:D) h. During the cotton-free period in the Lower Rio Grande Valley, female boll weevils without access to cotton resorb their unlaid eggs and enter reproductive diapause. However, when they were provided daily with greenhouse-grown cotton squares, commencement of oviposition began after 7, 15, or 20 d, depending on when they were captured. Females captured later in the winter fed longer before laying eggs than those captured in the early fall, suggesting that it may take females longer to terminate diapause the longer they have been dormant. The rate of feeding by females was significantly less during the winter months, and this may have affected the rate of diet-mediated termination of dormancy. Females of the first and second generations after the overwintering generation produced a significantly higher percentage of progeny surviving to adulthood and a higher proportion of these progeny were females. Offspring development time from overwintering female parents was significantly longer than that from first and second generations under the same laboratory conditions. The total number of lifetime eggs produced by females of the second generation during the cotton-growing season were ≈9.9-fold higher than for overwintering females and 1.5-fold higher than for first-generation females. Life table calculations indicated that the population of second-generation boll weevils increased an average of 1.5-fold higher each generation than for females of the first generation and 22.6-fold higher than for overwintering females. Our data showed variation in boll weevil survival, development, and reproductive potential among the overwintering and first-and second-generation females, suggesting inherent seasonal fluctuations in these parameters. KeywordsAnthonomus grandis grandis, survival, development, reproduction, seasonal variation Disciplines Comparative and Evolutionary Physiology | Entomology CommentsThis article is from Environmental Entomology 36 (2007) ABSTRACT The feeding and oviposition activity of overwintering boll weevils, Anthonomus grandis grandis (Boheman), and seasonal ßuctuations in development, survival, and reproduction of progeny of overwintering and Þrst-and second-generation boll weevil females were determined in the laboratory at 27ЊC, 65% RH, and a photoperiod of 12:12 (L:D) h. During the cotton-free period in the Lower Rio Grande Valley, female boll weevils without access to cotton resorb their unlaid eggs and enter reproductive diapause. However, when they were provided daily with greenhouse-grown cotton squares, commencement of oviposition began after 7, 15, or 20 d, depending on when they were captured. Females captured later in the winter fed longer before l...

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Physiological Activity of the Boll Weevil During the Fall and Winter in Subtropical Areas of the Rio Grande Valley of Texas12

Cited by 30 publications

References 0 publications

Effects of Planting Dates on Boll Weevils (Coleoptera: Curculionidae) and Cotton Fruit in the Subtropics

Effects of Planting Dates on Boll Weevils (Coleoptera: Curculionidae) and Cotton Fruit in the Subtropics

Survival pattern of the boll weevil during cotton fallow in Midwestern Brazil

Reproductive Potential of Overwintering, F1, and F2 Female Boll Weevils (Coleoptera: Curculionidae) in the Lower Rio Grande Valley of Texas

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