A utilização de resíduos industriais, como o lodo de curtume, em substratos para produção de mudas é uma alternativa para redução de custos de produção, e para destinação dos resíduos industriais. O cultivo de pimentas tem ganhado espaço no mercado brasileiro favorecendo principalmente a agricultura familiar, onde um dos desafios é diminuir o custo de produção. O objetivo do trabalho foi avaliar o efeito de diferentes concentrações de lodo de curtume bovino adicionado ao substrato comercial na germinação, desenvolvimento e qualidade de mudas de pimenta biquinho. O experimento foi conduzido em delineamento de blocos casualizados com 7 tratamentos, sendo dois substratos comerciais: Provaso® (TP) e Bioplant® (TL0); e cinco diferentes proporções de lodo desidratado (10, 30, 50, 70 e 90%) misturados ao substrato Bioplant®. Avaliou-se nesse experimento o percentual de germinação, características de desenvolvimento e Índice de Qualidade de mudas de Dickson (IQD). O potencial germinativo foi maior para os tratamentos com adição de lodo de curtume ao substrato comercial Bioplant®. Os melhores resultados para as características de desenvolvimento das mudas ocorreram com a adição de lodo desidratado ao substrato Bioplant® nos intervalos de 30 a 70% de lodo no substrato. O índice de qualidade de mudas foi maior para a mistura de 30% de lodo de curtume desidratado com Bioplant®.

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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.

The present work aimed to characterize and evaluate Capsicum peppers in the South of the State of Espírito Santo, in order to estimate the variability among the accessions for the Germplasm Bank implementation. For this, 33 genotypes were collected through donations in four municipalities in the region. The genotypes were characterized based on nine quantitative descriptors: number of seeds per fruit (NS), number of fruit locules (NL), number of fruits per plant (NFR), plant height (PH), leaf width (LW), leaf length (LL), fruit length (FRL) and fruit diameter (FRD). Analysis of variance and means grouping by the Scott-Knott test was performed (P=.01). To estimate the diversity, the Tocher method was realized. The GT Biplot analysis was performed with using RStudio program to estimate discrimination, representativeness and correlation of characteristics. It was found a great diversity among the studied genotypes, being able to emphasize the accession Ifes 01 and Ifes 03 as the most divergent ones. The Tocher grouping allowed the formation of seven groups. The biplot analysis presented the formation of three groups of characteristics. The access Ifes 01 stood out for the group of characteristics FRL, NS and FRD. The Ifes 32 accession was highlighted for the PH and DC characteristics group, and the Ifes 20 accession was highlighted for the group formed by the NFR characteristic. It was observed that the characteristics that contributed the most to the divergence of accessions were PH and DC, and the most representative characteristic was DC. So, it’s concluded that there is great variability among the genotypes collected, presenting great phenotypic variation for the nine characters studied. In addition, some accesses were promising for plant breeding programs, pointing to gains in the various segments of the peppers market, which shows the importance of the collections of the producers in the South of Espírito Santo.

Nitrogen-use efficient and leaf-disease resistant corn (Zea mays L.) cultivars are important to reduce costs and increase sustainability in farming. Studies have shown that non-additive genes may enhance nutrient-use efficiency and disease resistance in corn crops. This work aimed to analyze the responses of popcorn hybrids to northern leaf blight (NLB) under contrasting nitrogen availability. We evaluated NLB incidence and severity in 28 diallel hybrids and their parental lines. Competition trials were set in a randomized block design and arranged in a 6 × 6 lattice. The trials were conducted in four environments: two sites and two nitrogen availability conditions per site (ideal [IN] and low [LN]). The area under the progress curve of NLB incidence and severity was estimated for each genotype. To reduce the disease in multiple environments, general combining ability (GCA) of parentals is more important than specific combining ability (SCA) of hybrid combinations. The interactions between SCA and environment were significant for the disease resistance. Therefore, the best combinations should be identified for each environment so that NLB resistance could be enhanced. Low nitrogen availability enhanced the ability of parents to reduce NLB incidence and severity. Hybrid development is an efficient strategy to attain genetic gains in NLB resistance in multiple environments, regardless of N availability. The exploitation of additive gene effects may assist plant breeders in obtaining promising parents for the development of resistant hybrids in multiple locations. INTRODUCTIONOverusing mineral fertilizers and agrochemicals harm natural resources essential for farming sustainability (Fagard et al.,Abbreviations: AUDPC, area under the disease progress curve; AUDPC/I, area under the disease progress curve for leaf blight incidence; AUDPC/S, area under the disease progress curve for leaf blight severity; GCA, general combining ability; IN, ideal nitrogen availability; GCA, general combining ability; LN, low nitrogen availability; NLB, northern leaf blight; SCA, specific combining ability.