Impact of Helicoverpa armigera larval density and crop phenology on yield and quality losses in processing tomato: developing fruit count-based damage thresholds for IPM decision-making

Torres‐Vila, Luis M.; Rodríguez‐Molina, M. C.; Lacasa-Plasencia, A

doi:10.1016/s0261-2194(02)00205-3

Cited by 30 publications

(21 citation statements)

References 16 publications

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“…27 Feeding in polyphagous lepidopteran larvae is often influenced by the species and phenology of the crop plant. 28,29 For example, in tomato, C. chalcites feeds on the parenchyma on the underside of leaves and then rolls the edges of the leaves together and begins to eat through the leaves, making them appear skeletonised. 30 As the efficacy of a virus-based insecticide depends on the ability to deliver a lethal quantity of OBs to feeding larval stages of the pest, 31 we determined the influence of OB dose on virus-induced pest mortality in growth chamber experiments on tomato plants.…”

Section: Introductionmentioning

confidence: 99%

Efficacy of an alphabaculovirus-based biological insecticide for control ofChrysodeixis chalcites(Lepidoptera: Noctuidae) on tomato and banana crops

et al. 2015

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Section: Introductionmentioning

confidence: 99%

Efficacy of an alphabaculovirus-based biological insecticide for control ofChrysodeixis chalcites(Lepidoptera: Noctuidae) on tomato and banana crops

et al. 2015

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“…The cotton bollworm, Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae), also known as the tomato fruitworm, is one of the most important pests of tomato . Females mainly lay eggs in the flowering period, although larvae may attack any phenological stage of the plant and are especially likely to damage the fruit.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the pest's preference for flowers and fruits, in addition to its polyphagy, high mobility and fecundity, makes it a major pest . Quality control in the tomato processing industry set the damage limit to 2–5% of harvested tomatoes, but if larvae are present, this limit is reduced to 0–2% …”

Section: Introductionmentioning

confidence: 99%

Insecticidal efficacy and persistence of a co‐occluded binary mixture of Helicoverpa armigera nucleopolyhedrovirus (HearNPV) variants in protected and field‐grown tomato crops on the Iberian Peninsula

Arrizubieta

Simón

Torres‐Vila

et al. 2015

Pest Management Science

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BACKGROUND A binary co‐occluded mixture (HearSP1B:LB6) of Helicoverpa armigera single nucleopolyhedrovirus (HearNPV) variants was previously found to be highly pathogenic under laboratory conditions. The insecticidal efficacy and persistence of this mixture were determined in greenhouse and field‐grown tomato crops in Spain and Portugal. RESULTS Concentrations of 109–1011 occlusion bodies (OBs) L−1 of HearSP1B:LB6 resulted in 89–100% mortality of larvae on treated tomato plants in growth chambers. In protected tomato crops, application of 1010 OBs L−1 of HearSP1B:LB6 was as effective as Bacillus thuringiensis (Bt) and spinosad in reducing the percentage of damaged fruits, and resulted in higher larval mortality than the Bt treatment. In open‐field tomato crops, virus treatments were as effective in reducing the percentage of damaged fruit as spinosad, Bt and chlorpyrifos treatments. The persistence of the insecticides on tomato plants was negatively correlated with solar radiation in both field and greenhouse settings. Residual insecticidal activity of OBs on protected tomato crops at 6 days post‐application was 55 and 35% higher than that of Bt and spinosad respectively. On field‐grown tomato, OB persistence was significantly lower than with spinosad or chlorpyrifos. CONCLUSION The efficacy and persistence of HearSP1B:LB6 OBs were comparable with those of commercial insecticides in both field and greenhouse tomato crops. Future studies should focus on reducing application rates to determine insecticidal efficacy at lower OB concentrations. © 2015 Society of Chemical Industry

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“…For many pests, targeting a specific stage at a certain threshold density is necessary not only to avoid economic injury to the crop, but also to most effectively limit population growth. For example, early stage larvae of Lepidoptera and Coleoptera are frequently targeted (Shelton et al, 1986;Hare, 1990;Fitt, 1994;Torres-Vila et al, 2003) because of their greater susceptibility to chemical treatments. But a cohort of early instars may also represent a significant proportion of a crop infestation that can be reduced through well-timed control measures to suppress population growth.…”

Section: Introductionmentioning

confidence: 99%

Phenology and demography of Homalodisca coagulata (Hemiptera: Cicadellidae) in southern California citrus and implications for management

Castle

Naranjo

et al. 2005

Bull. Entomol. Res.

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Populations of Homalodisca coagulata (Say) were sampled from citrus orchards in southern California, USA to characterize and quantify seasonal occurrences of nymphs and adults with the goal of identifying management opportunities through well-timed treatments and/or natural enemy releases. Higher densities of H. coagulata in 2001 contributed to a complete seasonal profile that began in early spring with the emergence of first instar nymphs and their progression through five nymphal instars lasting until mid-August. Adult emergence began in mid-June with peak adult densities attained from mid to late August followed by a gradual decline through autumn. A persistent and significant male bias was observed in the adult sex ratio from the time of first emergence through mid-October in oranges; the same trend was present in lemons, but with more variability. Adult densities gradually declined through the winter months into the following spring before rapidly increasing again in June as the 2002 spring generation of nymphs began emerging as adults. The seasonal timing of nymphs and adults in 2002 was nearly identical to that observed the previous year. Phenology data from both years were incorporated into a stochastic, temperature-dependent model that predicts the occurrences of H. coagulata stages through time. Applications of imidacloprid early in the spring generation of nymphs proved very effective at reducing nymphs and sustaining lower densities of adults through summer.

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Impact of Helicoverpa armigera larval density and crop phenology on yield and quality losses in processing tomato: developing fruit count-based damage thresholds for IPM decision-making

Cited by 30 publications

References 16 publications

Efficacy of an alphabaculovirus-based biological insecticide for control ofChrysodeixis chalcites(Lepidoptera: Noctuidae) on tomato and banana crops

Efficacy of an alphabaculovirus-based biological insecticide for control ofChrysodeixis chalcites(Lepidoptera: Noctuidae) on tomato and banana crops

Insecticidal efficacy and persistence of a co‐occluded binary mixture of Helicoverpa armigera nucleopolyhedrovirus (HearNPV) variants in protected and field‐grown tomato crops on the Iberian Peninsula

Phenology and demography of Homalodisca coagulata (Hemiptera: Cicadellidae) in southern California citrus and implications for management

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