Deposit of pesticides without and with adjuvants on citrus seedlings following different intervals of artificial rain

Decaro, Ricardo Augusto; Decaro, Sérgio Tadeu; Ferreira, Marcelo da Costa

doi:10.1590/0103-8478cr20150064

Cited by 10 publications

(10 citation statements)

References 8 publications

(5 reference statements)

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“…Most studies indicate that the lower the application time and the rainfall, the lower the deposition of the phytosanitary product. Decaro et al (2016) reported that the deposition (μg per cm 2 ) of propargite and spirodiclofen on orange leaves was lower after rainfalls, mainly one hour after spraying, corroborating with the results of this study.…”

Section: Resultssupporting

confidence: 92%

“…The decrease in surface tension was correlated with the decrease in the deposit of broth according to a study conducted by Decaro et al (2016) for the same treatments used in this study. In field conditions, Oliveira et al (1997) reported that there were no differences in the retention of broth for the acaricide propargite (Omite 720 BR CE Arysta LifeScience) when associated with the adjuvants since it already has adjuvants in its composition, agreeing with the results found in this study.…”

Section: Resultsmentioning

confidence: 71%

“…Adjuvants are used to increase the efficiency of the phytosanitary product, acting as a reducing agent of surface tension of spray droplets and/or increasing the viscosity of the liquid (CUNHA and ALVES, 2009;CUNHA et al, 2010). However, adjuvants may reduce broth deposit in leaves (OLIVEIRA et al, 1997, DECARO et al, 2016. The decrease in the surface tension causes droplets to scatter better, but they aggregate on the leaf surface, forming larger droplets that flow away and increasing the loss process (OCAMPO-RUIZ and MATUO, 1994).…”

Section: Resultsmentioning

confidence: 99%

“…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: 92%

Section: Resultsmentioning

confidence: 71%

Section: Resultsmentioning

confidence: 99%

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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“…These compounds may contribute to the compatibility of products in the sprayer tank and improve the performance of agricultural applications, influencing the viscosity, surface tension, contact angle, pH, electrical conductivity, and retention and droplet deposition (Prado et al, 2016;Cunha et al, 2017). Each adjuvant has specific properties aimed at acting in increased permeability and absorption of molecules, retention of spray solution, surface coverage, reduction of foam, adequacy of droplets for the dispersion of spray solution on targets, among others Decaro Junior et al, 2015;Decaro et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Effect of Pesticide Addition Sequence on the Preparation of Phytosanitary Spray Solutions

et al. 2019

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The addition of adjuvants to herbicide solutions is aimed at preserving or enhancing the biological effect of treatment. However, it is commonly performed without knowledge of the physicochemical interactions between products. This study aimed to assess the effects of different addition sequences of the herbicide aminopyralid + fluroxypyr and adjuvants in the preparation of phytosanitary spray solutions on the surface tension and contact angle. Two experiments were carried out with herbicide doses of 1 and 2 L ha-1 associated with the adjuvants mineral oil (MO), silicone-polyether copolymer (SIL), and a mixture of phosphatidylcholine (lectin) and propionic acid (LEC), all at a proportion of 0.3% v v-1. The application rate was 150 L ha-1. Surface tension was measured by the pendant droplet method. Contact angle was measured on the adaxial and abaxial surfaces of leaves of the pasture weed Senna obtusifolia and parafilm. Preparation sequence did not change the contact angle on any of the analyzed surfaces at a dose of 1 L ha-1 of herbicide. For the dose of 2 L ha-1, the adjuvants SIL and LEC showed a higher spreading when previously added to the herbicide. MO resulted in a higher spreading when added after the herbicide, with higher surface coverage. Therefore, the preparation sequence influences the dispersion of phytosanitary spray solutions on targets.

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Development and implementation of a laboratory spray device and rainfall simulator for retention research using small amounts of agroformulations

Zwertvaegher¹,

Daele²,

Verheesen³

et al. 2016

Pest. Manag. Sci.

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Deposit of pesticides without and with adjuvants on citrus seedlings following different intervals of artificial rain

Abstract: For a crop protection product to achieve its goal, the product must be applied and remain on the leaves until it is absorbed. This situation may be compromised due to rainfall after spraying, thus necessitating reapplication which increase

Cited by 10 publications

References 8 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

Effect of Pesticide Addition Sequence on the Preparation of Phytosanitary Spray Solutions

Development and implementation of a laboratory spray device and rainfall simulator for retention research using small amounts of agroformulations

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