FITOTOXICIDADE DE FUNGICIDAS, ACARICIDAS E INSETICIDAS, SOBRE O MAMOEIRO (Carica papaya L.) CULTIVAR SUNRISE SOLO IMPROVED LINE 72/12 EM CONDIÇÕES DE CAMPO

Vieira, Alcílio; Ruggiero, Carlos; Marin, Sérgio Lúcio David

doi:10.1590/s0100-29452001000200023

Cited by 5 publications

(3 citation statements)

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“…In both experiments, plants were sprayed with the tested lime sulfur concentrations using a costal sprayer Brudden® SS model with a capacity of 5 L. Visual symptoms of phytotoxicity for each concentration tested were evaluated by two observers after 1, 5 and 10 days of treatment. A visual scale of phytotoxicity was used: rank 0: plants with normal leaves and no signs of burns; rank 1: plants with slightly damaged leaves and/or with small burned areas; rank 2: plants with medium damaged leaves, yellow with burnt edges and tips; rank 3: plants with heavily damaged leaves, showing severe defoliation.…”

Section: Methodsmentioning

confidence: 99%

Lime sulfur toxicity to broad mite, to its host plants and to natural enemies

Venzon

Oliveira

Perez

et al. 2012

Pest Management Science

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Section: Methodsmentioning

confidence: 99%

Lime sulfur toxicity to broad mite, to its host plants and to natural enemies

Venzon

Oliveira

Perez

et al. 2012

Pest Management Science

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“…The visual scale of phytotoxicity proposed by Vieira et al (2001) was used, with 0: plants with normal leaves and no signs of burns; 1: plants with slightly damaged leaves and/or with small burned areas; 2: plants with medium damaged leaves, yellow with burnt edges and tips; 3: plants with heavily damaged leaves, showing severe defoliation.…”

Section: Control Of T Evansi In the Greenhousementioning

confidence: 99%

Alternative control of Tetranychus evansi Baker & Pritchard (Acari: Tetranychidae) on tomato plants grown in greenhouses

Soto¹,

Venzon²,

Oliveira³

et al. 2010

Neotrop. entomol.

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-Tetranychus evansi Baker & Pritchard is an important pest of solanaceous plants, including tomatoes. This mite is characterized by a high reproductive rate, which leads to high population growth in a short period of time causing important economic damage. Control of T. evansi is mainly through synthetic acaricides. In searching for environmentally friendly control measures, we evaluated the effi ciency of alternative products to control T. evansi on tomato plants under greenhouse conditions. The products tested were lime sulphur and neem based products. We fi rst estimated the lethal concentration (LC) and instantaneous rate of increase (r i ) of T. evansi exposed to different product concentrations in laboratory conditions, and later tested the effi cacy of LC 95 and the concentrations that restrained mite population growth (r i = 0) in greenhouse conditions. The following treatments were repeated three times: NeemPro (81.0 and 71.6 mg a.i./l), Natuneem (31.1 and 20.4 mg ai/l), Organic Neem (39.1 and 30.4 mg a.i./l), lime sulphur (1.0 and 0.6%) and water (control). For all products, control provided by LC 95 was higher than provided for lower concentrations (r i = 0) one day after spraying. However, after fi ve days, for both concentrations, the percentage of T. evansi population reduction was superior to 95% and increased over time. Only plants sprayed with Natuneem (31.1 mg a.i./l) showed symptoms of phytotoxicity. Lime sulphur and neem based products, applied in appropriate concentrations and formulations, bear out as a viable alternative to control T. evansi on tomato plants.KEY WORDS: Acari, Azadirachta indica, lime sulphur, effi ciency, phytotoxicityThe tomato red spider mite, Tetranychus evansi Baker & Pritchard, is an important pest of solanaceous plants, especially tomatoes (Flechtmann 1983, Bonato 1999, Ferragut & Escudero 2002. This mite is characterized by a high reproductive capacity, which leads to high population levels in a short time, causing important economic damage (Moraes & McMurtry 1986). Additionally, the mite produces large quantities of webs on the infested plants, hampering the action of natural enemies (Gerson 1985, Sabelis & Bakker 1992. The control of T. evansi in tomato is done mainly with application of synthetic pesticides. Despite its relative effi ciency, chemical control has several negative impacts as the selection of resistant individuals due to the continuous use of certain active ingredients, the reduction or elimination of benefi cial species, the high toxicity of products to applicators, and the presence of residues in food (Picanço et al 2007, Maniania et al 2008.A viable alternative to the problems arising from excessive use of synthetic pesticides in tomato production is the use of methods that provide control with social and environmental safety. In the search for such methods, natural enemies are being evaluated as biological control agents of T. evansi (Wekesa et al 2005, Furtado et al 2007, Brito et al 2009. Another strategy that has been used where con...

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“…However, Silva et al [17], evaluating the effects of soybean seed treatments 28 days after emergence, found that the treatment with abamectin positively affected plant height, shoot dry matter, and root volume compared to the control (with no seed treatment). Studies with other crops, such as papaya (Carica papaya L.) [75] and tomato (Solanum lycopersicum L.) [76], did not report the phytotoxic effects of abamectin treatment as a strategy for nematode control.…”

Section: Discussionmentioning

confidence: 99%

Use of Visible Spectral Index and Soybean Plant Variables to Study Hidden Nematicide Phytotoxicity

Lemes,

Santos,

Coelho

et al. 2023

AgriEngineering

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Significant crop losses are due to plant-parasitic nematodes. Nematicides are expensive and potentially toxic to men, the environment, and plants. This study evaluated the hidden phytotoxicity effects of nematicides in soybeans. Two soybean cultivars (8473RSF and M7198IPRO) were evaluated with five nematicide treatments (biological, cadusaphos, abamectin, fluensulfone, and an untreated control) for changes in chlorophylls, biometrics, and spectral (TGI visible spectral index captured with a smartphone camera) variables to determine and anticipate the identification of plant stresses. Evaluations occurred 33, 47, and 66 days after sowing (DAS). The a/b chlorophyll proportion was greatest for M7198IPRO and cadusaphos. The chlorophyll variables did not present significant interactions or differences at 47 DAS, indicating that possible nematicide effects were transient and should be evaluated earlier than 33 DAS. Leaf area, leaf mass, and shoot mass were smaller for 8473RSF and outstanding for abamectin and fluensulfone. The response of the spectral index did not present significant interaction among the factors; however, at 33 and 47 DAS, the index was low for 8473RSF and lowest for cadusaphos only at 33 DAS. The correlations between the spectral index and other variables were significant and moderate for soybean total leaf area. Although no apparent phytotoxicity symptoms caused by nematicides were observed, the visible vegetation index generated using a smartphone camera can still improve crop management solutions.

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FITOTOXICIDADE DE FUNGICIDAS, ACARICIDAS E INSETICIDAS, SOBRE O MAMOEIRO (Carica papaya L.) CULTIVAR SUNRISE SOLO IMPROVED LINE 72/12 EM CONDIÇÕES DE CAMPO

Cited by 5 publications

References 0 publications

Lime sulfur toxicity to broad mite, to its host plants and to natural enemies

Lime sulfur toxicity to broad mite, to its host plants and to natural enemies

Alternative control of Tetranychus evansi Baker & Pritchard (Acari: Tetranychidae) on tomato plants grown in greenhouses

Use of Visible Spectral Index and Soybean Plant Variables to Study Hidden Nematicide Phytotoxicity

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