A comparison of sticker adjuvants for their effects on retention and rainfastening of fungicide sprays

Gaskin, R.E.; Steele, K. D.

doi:10.30843/nzpp.2009.62.4809

Cited by 12 publications

(10 citation statements)

References 6 publications

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“…The time between application and precipitation may also influence the efficiency of the plant protection product. Similar results were reported by other authors for the control of arthropod pests, diseases and weeds (DINARDO-MIRANDA et al, 2004;BRASVAULT et al, 2009;GASKIN and STEELE, 2009;PANNACCI et al, 2010;ANDERSEN et al, 2014). Most studies indicate that the lower the application time and the rainfall, the lower the deposition of the phytosanitary product.…”

Section: Resultssupporting

confidence: 86%

“…Several authors reported negative effects of rainfalls after spraying of pesticides (DINARDO-MIRANDA et al, 2004;BRÉVAULT et al, 2009, GASKIN andSTEELE, 2009;PANNACCI et al, 2010;ANDERSON et al, 2014;BORGES et al, 2015;DECARO et al, 2016). A study conducted by Gautam et al (2016) showed that artificial rainfalls reduced the efficiency of insecticides against the fly Drosophila suzukii Matsumura (Diptera: Drosophilidae).…”

Section: Introductionmentioning

confidence: 99%

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IMPACT OF RAINFALLS ON THE ACARICIDE PROPARGITE WITH AND WITHOUT ADDITION OF ADJUVANTS FOR THE CONTROL OF THE MITE Brevipalpus yothersi

2018

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Rainfalls may affect the efficiency of pesticides due to a decreased deposit of active ingredient on plants. This should be considered in spraying with acaricides, the main strategy used for the management of citrus leprosis, the main viral disease of the Brazilian citrus culture. Citrus leprosis disease is transmitted by Brevipalpus mites, mainly B. yothersi. The objective of this study was to evaluate the effects of artificial rains on the efficiency of the acaricide propargite in combination or not with adjuvants for the control of the mite B. yothersi. The experiment was conducted using orange plants grown in pots kept under greenhouse conditions. The acaricide propargite was evaluated isolated and with addition of the adjuvants polydimethylsiloxane (20mL cp/100 L of water) and a mixture of phosphatidylcholine (lecithin) and propionic acid (500 mL cp/100 L of water). After the application of the acaricide with and without the adjuvants, the plants were subjected to a 10-mm artificial rainfall at different time intervals: 5 minutes, and 1 and 12 hours after application. Thereafter, B. yothersi mites were transferred to plants for survival evaluation. The artificial rainfall affected negatively the efficiency of propargite isolated and in mixture. The addition of the adjuvant phosphatidylcholine and propionic acid impaired the efficiency of propargite due to an increased runoff of the broth and a decrease in the deposit of active ingredients on plants. We conclude that the acaricide propargite should not be used in combination with the adjuvants polydimethylsiloxane and mixture of phosphatidylcholine and propionic acid in rainy conditions.

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Section: Resultssupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

IMPACT OF RAINFALLS ON THE ACARICIDE PROPARGITE WITH AND WITHOUT ADDITION OF ADJUVANTS FOR THE CONTROL OF THE MITE Brevipalpus yothersi

2018

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“…In particular, adjuvants such as surfactants and polymer coatings can increase the rainfastness significantly by sticking the substance or its components (e.g., microcapsules) to the foliage or by reducing surface tension (Thacker and Young 1999;Hunsche 2006;Green and Beestman 2007;Gaskin and Steele 2009;Anderson et al 2014;Mela et al 2015). Not all factors seem to affect foliar dissipation equally, and often their effect is species-specific.…”

Section: Discussionmentioning

confidence: 99%

Dissipation of plant protection products from foliage

Ebeling

Wang²

2018

Environmental Toxicology and Chemistry

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In the environmental risk assessment for plant protection products in the European Union a default foliar dissipation half-life (DT50) of 10 d is used for the risk assessment of herbivorous birds and mammals feeding on sprayed foliage. This generic DT50 of 10 d is based on a compilation of residue trials conducted over 30 yr ago, in which many compounds and formulations were considered that are not used anymore. We therefore reassessed foliar dissipation based on a data set of 396 residue trials covering 30 compounds. Foliar DT50s were calculated, and potential factors determining dissipation were analyzed, such as crop group, residue zone, and rainfall. The strongest source of variability was found between individual trials. Other factors, including the residue zone and crop group, did not have a significant impact on dissipation. Only heavy rainfall (>6.5 mm/d, i.e., the 95th percentile of rainfall) had a statistically significant influence, although rainfall explained only approximately 5% of the overall variability. Moderate rainfall (≤6.5 mm/d) did not significantly correlate with dissipation and explained only 0.1% of the overall variability. Most importantly, the differences in DT50s between crops and residue zones were neither marked nor statistically significant; hence, trials from different residue zones and crops could be pooled to obtain more robust half-lives. Over all compounds, trials, zones, and crops the geometric mean DT50 was 3.2 d (90th percentile 7.9 d). Environ Toxicol Chem 2018;37:1926-1932. © 2018 SETAC.

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“…Retained residues (no rain) were generally highest with the superspreader type adjuvants and lowest with the pinene polymer type adjuvants, which were no different to captan alone ( Table 3). The pinene adjuvants are known to have less effect on improving spray retention compared to the superspreader/latex stickers (Gaskin & Steele 2009). Light rain had little effect on residues on leaf scars (Table 3) and spurs (data not presented).…”

Section: Resultsmentioning

confidence: 94%

“…Once dry, the efficiency of recovery of the dye in these sprays from rough surfaces may have been lower than for the slow-drying captan and pinene sprays. Dye recoveries (wash-offs) are normally undertaken immediately after spraying and before sprays have dried (Gaskin & Steele 2009), but it was not possible in this study to harvest spurs while wet because significant loss of spray volume could have occurred.…”

Section: Resultsmentioning

confidence: 99%

Effects of adjuvants on distribution and rainfastness of captan sprays on apple leaf scars to control European canker

Gaskin¹,

Manktelow²,

Northcott³

2014

NZPP

Self Cite

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Autumn leaf scars are an important pathogen infection site for European canker on apples Trials were undertaken to evaluate the effects of adjuvants on spray coverage of new leaf scars and determine if adjuvants could (1) impart any significant rainfastness to protectant captan sprays and (2) provide any redistribution of captan during a rain event postleaf drop Retention on fresh leaf scars was increased with the use of organosiliconelatex sticker adjuvants only Rain had little effect on spray residues but these adjuvants could improve rainfastness of captan due to their effects on spray retention Retention on stem wood and around leaf nodes was increased by up to sevenfold with the use of superspreadertype adjuvants due to redistribution of spray runoff from leaves High initial deposits resulted in postrain residues on leaf scars threefold higher than a captan spray alone Redistribution of captan onto exposed leaf scars in rain appears likely with these adjuvants

show abstract

A comparison of sticker adjuvants for their effects on retention and rainfastening of fungicide sprays

Cited by 12 publications

References 6 publications

IMPACT OF RAINFALLS ON THE ACARICIDE PROPARGITE WITH AND WITHOUT ADDITION OF ADJUVANTS FOR THE CONTROL OF THE MITE Brevipalpus yothersi

IMPACT OF RAINFALLS ON THE ACARICIDE PROPARGITE WITH AND WITHOUT ADDITION OF ADJUVANTS FOR THE CONTROL OF THE MITE Brevipalpus yothersi

Dissipation of plant protection products from foliage

Effects of adjuvants on distribution and rainfastness of captan sprays on apple leaf scars to control European canker

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