Alternative control to black spot disease in papaya genotypes

Santos, Pedro Henrique Dias dos; Silveira, Silvaldo Felipe da; Vivas, Marcelo; Carvalho, Beatriz Murizini; Pereira, Messias Gonzaga

doi:10.1590/0100-5405/2208

Cited by 12 publications

(8 citation statements)

References 7 publications

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“…Field experimentation with papaya has been carried out quite frequently in order to implement new technologies for the crop Santos et al, 2017) and to evaluate plant productivity (Oliveira et al, 2014;Dantas et al, 2015;Luz et al, 2015) and disease resistance (Poltronieri et al, 2017) of new genotypes. In experiments carried out to evaluate the productivity of new genotypes, Oliveira et al (2014) Dantas et al (2015) used 6 plants per plot and Luz et al (2015) 10 plants per plot, both with 4 replications in a randomized block design.…”

Section: Introductionmentioning

confidence: 99%

Optimum plot size for experiments with papaya genotypes in field

Schmildt¹,

Nascimento²,

Nascimento³

et al. 2018

Afr. J. Agric. Res.

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The objective of this study was to determine a suitable plot size for field experiments with papaya genotypes. Two experiments were carried out using a randomized complete block design with 11 and 12 papaya genotypes, respectively. In both experiments, plots consisted of one row, with 10 plants each. Spacing between rows was 3.5 m, with 1.5 m between plants. The characteristic evaluated was fruit production in t ha -1 in first year of cultivation, and the basic unit used was one plant. Suitable plot size was estimated using Lin and Binns, and Hatheway's methods. These methods are complementary and should be used together in the determination of the optimum plot size. The results of these tests showed that the optimum plot size for the evaluation of yield in papaya was four plants by plot with four replications each assuming 30% of the precision for establishing differences among the means of two genotypes.

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Section: Introductionmentioning

confidence: 99%

Optimum plot size for experiments with papaya genotypes in field

Schmildt¹,

Nascimento²,

Nascimento³

et al. 2018

Afr. J. Agric. Res.

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“…In view of the problems caused by fungicides in papaya crops, it is necessary to adopt alternative control strategies. Among them are the use of resistance-inducing products (Oliveira & Nishijima 2014, Santos et al 2017 and genetic resistance for the selection of resistant genotypes (Vivas et al 2012and 2015a, Poltronieri et al 2017. In spite of the efforts employed in the development of control methods against the black spot disease of papaya, no product is known to induce resistance in the plant, and neither there are cultivars resistant to the disease.…”

Section: Palavras-chavementioning

confidence: 99%

Selection of fungi with biocontrol potential against the black spot disease of papaya1

Vivas

Silveira

Santos

et al. 2017

Pesqui. Agropecu. Trop.

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The use of fungicides is the main control measure against the black-spot disease of papaya. The biological control is an alternative to that, being the selection of mycoparasitic fungi the first step in programs aiming at this kind of control. This study aimed to obtain and select fungi with potential to the biocontrol of the black spot disease of papaya. For this purpose, 24 isolates were collected from different regions and pathosystems, and then identified morphologically and by the ITS region sequencing. In order to evaluate the mycoparasite potential, two assessments, in a randomized block design, with three replications, were carried out in a shadehouse, being the obtained isolates inoculated on papaya leaves with black spot lesions. The average time for the appearance of mycoparasitism signs and the incidence of mycoparasitized black spot lesions were evaluated. Of the 24 isolates obtained, ten were from Hansfordia pulvinata, two from Lecanicillium lecaniium, two from Simplicillium lanossoniveum, one from Sarocladium implicatum and nine from Acremonium spp. A wide variability, concerning the mycoparasitism on black spot lesions, was observed, especially for the isolates H-611, H-613, H-614 and H-615, which showed the highest colonization averages. The results demonstrate that H. pulvinata has a great potential to be used as a biocontrol agent against Asperisporium caricae.

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“…According to Martelleto et al (2009), the difficulty in controlling the papaya black spot is most evident in the organic production system due to few research results and to restriction on conventional fungicide use. To contribute to the alternative control for this disease, the application of phosphite, foliar fertilizers, and resistance inductors has been studied (Pratissoli et al, 2007;Oliveira and Nishijima, 2014;Santos et al, 2017). Oliveira and Nishijima (2014) concluded that the acibenzolar-S-methyl product induces partial resistance to the papaya against black spot; thus, it may be an option for the control of the disease.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of hyperparasitic fungi to alternative products for use in the control of papaya black spot

et al. 2021

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The use of more than one control technique can maximize the reduction of the damages caused by the fungus Asperisporium caricae causal agent of the black spot in the papaya crop. The objective of this work was to evaluate the sensitivity of the fungi Hansfordia pulvinata and Acremonium spp. to alternative products with potential for use in the control of the black-spotted ptarmigan. Three isolates of Acremonium spp. (A-598, A-602 and A-617) and an isolate of H. pulvinata (H-611) were grown in BDA medium containing Agro-Mos  , Bion  , Ecolife  , Hortifospk  , Matriz G  , Vitaphol  separately. The Amistar 500WG  fungicide was used as a positive control and pure BDA as a negative control. The toxicity of the tested products was determined based on the values of the biological index, derived from the means of mycelial growth, sporulation and germination of conidia, in each experimental unit. In this way it was possible to select the products classified as compatible for all isolates, and to test them in vivo. In the greenhouse, only the isolates and isolates with selected products, were applied in papaya plants with foliar symptoms of black-spotted. The incidence of leaves with hyperparasites and the percentage of black-painted lesions colonized by the tested isolates were evaluated. Thus, the H-611 isolate proved to be compatible with most of the alternative products tested, except with Hortifos  . Bion  and Matrix  products were compatible with all tested isolates and could be used in conjunction with Acremonium spp. and H. pulvinata to control the papaya black spot, since these products did not present toxicity on the hyperparasitic fungi.

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Alternative control to black spot disease in papaya genotypes

Cited by 12 publications

References 7 publications

Optimum plot size for experiments with papaya genotypes in field

Optimum plot size for experiments with papaya genotypes in field

Selection of fungi with biocontrol potential against the black spot disease of papaya1

Sensitivity of hyperparasitic fungi to alternative products for use in the control of papaya black spot

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