The effects of temperature, humidity and rainfall on captan decline on apple leaves and fruit in controlled environment conditions

Xu, Xiangming; Murray, R. A.; Salazar, José Domingo; Hyder, Kieran

doi:10.1002/ps.1520

Cited by 29 publications

(21 citation statements)

References 24 publications

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“…Rainfall, and hence pesticide wash‐off from leaves, can cause rapid dissipation of pesticides 8, 29. The acephate and cypermethrin dissipation from day 0 to day 4 after the last application followed the order Tarat > Balai Ringin > Semongok (Fig.…”

Section: Discussionmentioning

confidence: 98%

Dissipation of acephate, chlorpyrifos, cypermethrin and their metabolites in a humid‐tropical vegetable production system

Chai

Mohd-Tahir

Hansen

2008

Pest Management Science

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Section: Discussionmentioning

confidence: 98%

Dissipation of acephate, chlorpyrifos, cypermethrin and their metabolites in a humid‐tropical vegetable production system

Chai

Mohd-Tahir

Hansen

2008

Pest Management Science

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“…In summary, we know that WSP can be used to study spray distribution, and that digital image analysis of these paper samples can be quick, repeatable and consistent with manual analysis of samples . We also know that pesticide residue analysis on an apple leaf substrate can be both accurate and precise . However, we do not know whether it is possible to accurately estimate pesticide residues using data derived from the analysis of pesticide‐exposed WSP, which would provide a low‐cost analysis method that allows for greater understanding of residues at micro‐spatial scales, such as within a single apple leaf.…”

Section: Introductionmentioning

confidence: 99%

Quantifying pesticide deposits and spray patterns at micro‐scales on apple (Malus domesticus) leaves with a view to arthropod exposure

Witton

Pickering

Alvarez³

et al. 2018

Pest Management Science

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BACKGROUNDPesticides used in commercial crop systems can adversely affect non‐target arthropod populations. The spatial distribution of pesticide residues is rarely studied at scales relevant to these populations. Here, we combine two methods for assessing pesticide spray deposits at spatial scales relevant to non‐target arthropods found in apple orchards. Pesticide residues were determined on individual apple leaves through conventional residue analysis; water‐sensitive paper was used to investigate spatial distributions in deposits at the micro‐scale. We also evaluated how accurately a digital image analysis program estimated pesticide residues.RESULTSWe found that mean pesticide spray coverage on water‐sensitive paper varied by up to 6.1% (95% CI 9.4%, 2.7%) within an apple orchard, and leaf residues varied by up to 0.95 (95% CI 0.54, 1.36) mg kg−1 within a tree. Leaf residues based on analytical chemistry were six times lower than pesticide deposition estimated through image analysis of water‐sensitive paper, although these correlated strongly. This correlation allowed estimation of actual residues by application of a correction factor.CONCLUSIONOur method demonstrates accurate estimation of pesticide deposits at the individual leaf scale through digital analysis of water‐sensitive paper and is a low‐cost, rapid alternative to conventional residue analysis techniques. © 2018 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.

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“…The optimal conditions for P. aphanis to thrive are long periods of temperatures between 18° and 22.5°C and an alternation between low and high relative humidity common in late summer- early fall (Amsalem et al, 2006). Since most day-neutral cultivars are susceptible to powdery mildew, additional treatments of fungicides are required to prevent and reduce the disease, leading to higher costs of production and potentially more pesticide residues on fruits (Xu et al, 2008). Also, several fungicides used against powdery mildew are part of quinone outside inhibitors (QoI) and sterol demethylation inhibitors (DMI).…”

Section: Introductionmentioning

confidence: 99%

Silicon Transporters and Effects of Silicon Amendments in Strawberry under High Tunnel and Field Conditions

et al. 2017

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Together with longer production periods, the commercial transition to day-neutral strawberry (Fragaria × ananassa) varieties has favored the development of diseases such as powdery mildew (Podosphaera aphanis) that thrives in late summer-early fall. In an attempt to find alternative solutions to fungicides currently employed to curb the disease, we wanted to investigate the potential of silicon (Si) amendments that have been associated with prophylactic properties against powdery mildews. To this end, our first objective was to determine if strawberry was a Si-competent species following the recent characterization of the properties of Si transporters that plants must carry to uptake silicic acid. Based on genomic data, we were able to conclude that strawberry contained both functional influx (Lsi1) and efflux (Lsi2) transporters for Si uptake. Subsequently commercial experiments under high tunnel and field conditions were conducted with different Si fertilization regimes: constant soluble Si feeding in high tunnel, and bi-weekly soluble Si feeding or three concentrations of calcium silicate fertilization in the field. Results from high tunnel experiments showed that strawberry could accumulate as much as 3% Si on a dry-weight basis, the highest concentration ever reported for this species. All six tested cultivars contained roughly the same concentration, thereby confirming the limited genetic variability, also observed in other species, associated with the trait. Silicon fertilization under high tunnel led to a significant reduction of powdery mildew severity in both years and on all cultivars, and a significant increase in yield of marketable fruits reaching as much as 300% with cv. Monterey. By contrast, Si fertilization under field conditions in soils deficient in plant available Si, either in soluble or solid form, did not result in significant accumulation of Si in plants, regardless of the cultivars, year or concentrations. Our results have thus provided both genotypic and phenotypic proof that strawberry can greatly benefit from Si fertilization, but have also highlighted the importance of validating the fertilization regime to ensure that Si is properly absorbed and/or available to the plant.

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The effects of temperature, humidity and rainfall on captan decline on apple leaves and fruit in controlled environment conditions

Abstract: Captan loss on leaf and fruit surfaces is primarily due to rain washoff.

Cited by 29 publications

References 24 publications

Dissipation of acephate, chlorpyrifos, cypermethrin and their metabolites in a humid‐tropical vegetable production system

Dissipation of acephate, chlorpyrifos, cypermethrin and their metabolites in a humid‐tropical vegetable production system

Quantifying pesticide deposits and spray patterns at micro‐scales on apple (Malus domesticus) leaves with a view to arthropod exposure

Silicon Transporters and Effects of Silicon Amendments in Strawberry under High Tunnel and Field Conditions

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