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Search Results: 1 - 10 of 15429 matches for " Laércio Zambolim "
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Progresso de doen?as fúngicas e correla??o com variáveis climáticas em mamoeiro
Suzuki,rcio Shiguero;Zambolim, Laércio;Liberato, José Ricardo;
Summa Phytopathologica , 2007, DOI: 10.1590/S0100-54052007000200011
Abstract: the effect of climatic conditions on progress of fungal diseases of papaya were evaluated in three experimental areas in linhares, state of espirito santo, brazil. first area was carried out using traditional system and was drip irrigated; second area was also carried out using traditional system, but it was overhead irrigated, and third area was carried out using organic system with micro spray. it was evaluated three different systems of cultural control in the first area: 1- papaya plants not sprayed with fungicides with any leaf removal (check treatment without sanitation); 2- papaya plants not sprayed with fungicides with leaf removal (check treatment with leaf removal), and 3- papaya plants sprayed with fungicides without leaf removal (grower treatment). each system received four plots with 20 plants. evaluation was done in 10 plants in the center of plots. incidence and severity of ascochyta leaf spot, black spot and powdery mildew were evaluated on leaves. it was evaluated the incidence and stem end rot of fruits. epidemics of ascochyta leaf spot are favoured by temperatures ranging from 15 oc to 20 oc. epidemic of black spot occurred when temperature ranged from 25 oc to 30 oc with relative humidity ranging from 80 to 100%, from november to march. powdery mildew development was favored by temperatures from 15 oc to 20 oc and relative humidity from 60 % to 70%. it was not observed any relation between incidence of stem end rot of papaya and acumulated rain 15 days before the evaluation (r less than 0.21). incidence of fruit rot diseases caused by anthracnose and chocolate spot did not correlate with weather conditions. ascochyta leaf spot was detected in all the evaluation data with maximum severity from the juliana date 155 to 250 and minimum from 20 to 80; the black spot increased from date juliana 326 to 70 with maximum disease severity on the date 336; powdery mildew increased in two distinct times: one from the date 330 to 80 and another form the date 2
Doen?as do milho causadas por fungos do gênero Stenocarpella
Casa, Ricardo T.;Reis, Erlei M.;Zambolim, Laércio;
Fitopatologia Brasileira , 2006, DOI: 10.1590/S0100-41582006000500001
Abstract: stemocarpella macrospora and s. maydis may cause seed rot, seedling blight, stem and ear rot and leaf spot in corn. normally these fungi are the main grain rot causal agent when ears are infected. the damage caused exclusively by stenocarpella has not yet been determined. the pathogens are found in practically all maize-growing regions of brazil. the major disease intensity occurs under corn monoculture, mainly in small farms and fields for seed production where corn is continuously cultivated. corn debris and infected seed are the primary source of inoculum. the inoculum, consisting of conidia produced in plant debris, is disseminated at short distance by wind and rain splash. long distance dissemination occurs by seeds. plant infection may occur systemically with inoculum coming from seeds, as mycelium, and/or through direct penetration of leaf sheats, foliar blade, peduncle and ear husks, from spore deposition, germination and penetration. the optimal temperature for mycelial growth and conidial germination is between 23 and 28 oc for both fungi. the main strategies to control these diseases are based on the elimination and/or reduction of primary inoculum, the use of healthy seed, seed treatment with fungicide of the benzimidazoles group and crop rotation. there is little information about disease resistance in commercial hybrids in brazil. balance of soil fertility and avoidance of high plant population may also help to reduce the infection.
Dispers?o vertical e horizontal de conídios de Stenocarpella macrospora e Stenocarpella maydis
Casa, Ricardo T.;Reis, Erlei M.;Zambolim, Laércio;
Fitopatologia Brasileira , 2004, DOI: 10.1590/S0100-41582004000200004
Abstract: experiments were carried out in the field to quantify airborne dispersal of stenocarpella maydis and s. macrospora conidia from naturally infected corn (zea mays) straw. the data indicated that 93% and 88% of the total number of sampled conidia of s. maydis and s. macrospora, respectively, were trapped during the day, differing statistically from the night period. the number of sampled conidia of both fungi, was inversely proportional to the vertical and horizontal distance of spore traps from the inoculum source. conidia were collected up to a height of 2.0 m and up to 120.0 m from the inoculum source. in both experiments, the frequency and the number of collected spores were the highest at a height of 25.0 cm and at a distance of 20.0 m from the inoculum source. conidia was dispersed in the air as individual spores and/or grouped in cirri and not essentially associated to rain splashes.
Decomposi??o dos restos culturais do milho e sobrevivência saprofítica de Stenocarpella macrospora e S. maydis
Casa, Ricardo T.;Reis, Erlei M.;Zambolim, Laércio;
Fitopatologia Brasileira , 2003, DOI: 10.1590/S0100-41582003000400002
Abstract: an evaluation was performed on the saprophytic survival of stenocarpella macrospora and s. maydis in corn (zea mays) debris, under no-till cropped corn in commercial fields in the planalto médio of rio grande do sul, during the 1998 and 2000 growing seasonsthe presence of infected corn residue at sowing time was shown to ensure the presence and viability of stenocarpella spp. in the 1995 growing season corn residue decomposed 78.5% of its weight under the no-till system after 29 months of field exposure. in 1998, it was shown that decomposition of corn residue segments infected by s. maydis and s. macrospora, kept at the soil surface, was slower than when buried. in spite of the fact that the frequency of pycnidia of s. maydis and s. macrospora decreased over time its presence was detected for up to 320 days in corn stalks kept at the soil surface. isolations and conidia viability of s. maydis and s. macrospora in stalks kept at the soil surface were higher than 90% after 320 days in the field. data showed that when corn is cultivated under the no-till system, the presence of infected residue ensures the presence and viability of s. maydis and s. macrospora.
POTATO EARLY BLIGHT EPIDEMICS AND COMPARISON OF METHODS TO DETERMINE ITS INITIAL SYMPTOMS IN A POTATO FIELD
Campo Arana,Rodrigo Orlando; Zambolim,Laércio; Costa,Luiz Claudio;
Revista Facultad Nacional de Agronomía, Medellín , 2007,
Abstract: the influence of an early blight epidemic on potato tuber yield was evaluated in three field experiments during 2000 to 2002 crop seasons under vi?osa, minas gerais state growing conditions. through a disease severity gradient method, used four different dosages of fungicide chloratalonil were obtained four epidemic levels with severity range of d1 (maximum), plot without fungicide treatment, to d4 (minimum), plot with fully dosage fungicide commercial recommended, were obtained, which allowed for comparison of the epidemic effect on plant growth and tuber yield, and indicated the time for initiating of the first early blight (alternaria solani) lesions on potato foliage the disease was predicted by using the methods based either degree days (dd) with base temperature of 7oc and physiological days (pd) having minimum, optimum and maximum temperature of 7, 21 and 30oc, respectively, accumulated during the period between planting and the first symptom appearance. plots with higher disease levels along the gradient had significantly loss tuber yield in all trials. the highest yield reduction of 49,6; 52,7 and 58,2% occurred in d1, plots without fungicide treatment, during the years 2000, 2001 and 2002, respectively. the epidemic prediction through accumulated dd or pd did not indicate the appropriate time to initiate the epidemic control. however, the pd method that predicted the first symptoms between 240 and 333 accumulated pds was found to be more adequate. the data revealed that green leaf area and tuber yield reduction caused by the early blight is dependent upon the disease severity. compared to the others, the pd method appears to be most suitable to determine when the disease will establish, and thus can be recommended to initiate the disease management at 250 accumulated pds, under disease-favorable climatic conditions.
Incidência de fungos em pós-colheita de banana 'Prata an?'(Musa AAB)
Moraes, Wilson da Silva;Zambolim, Laércio;Lima, Juliana D.;
Summa Phytopathologica , 2006, DOI: 10.1590/S0100-54052006000100010
Abstract: the objetive of this work were to determine the occurrence and frequency of fungus in 'prata an?' banana and to elucidate the causal agent of post harvest rots on fruits from jaíba, minas gerais, brazil. two isolation methods were used: diluition in placs from whashed green fruits and direct of mature fruits. the fungus colletotrichum musae, trichoderma harzianum, fusarium equisetii, penicillium sp., aspergillus parasiticus, trichothecium roseum, colletotrichum acutatum, alternaria sp., cladosporium musae and curvularia lunata were the more freqüentilly associated to fruits. the fungus pathogenicity were tested by substituition of green fruits pell discs for micellium discs. colletotrichum musae showed lesioned average area arround of inoculation point equal to 5,8 cm2, while in the remaining of fungus tested the lesioned average area were smaller than 1,50 cm2. this results showed that c. musae is the primary agent of examined fruits rotteness, with 100 % of incidence while the remaining of fungus were limited to attach the injury arround of inoculation point. the latent infection mode caused by c. musae favour firsty the tissue external colonization and after the opportunists fungus accelerate the fruits and crown rotteness.
Dispers o vertical e horizontal de conídios de Stenocarpella macrospora e Stenocarpella maydis
Casa Ricardo T.,Reis Erlei M.,Zambolim Laércio
Fitopatologia Brasileira , 2004,
Abstract: Em experimentos conduzidos no campo, quantificaram-se a dispers o vertical e horizontal dos conídios de Stenocarpella maydis e S. macrospora liberados de palha de milho (Zea mays) naturalmente infetada. Verificou-se que 93% do número total de conídios de S. maydis e 88% de S. macrospora foram capturados durante o dia, diferindo estatisticamente do período noturno. O número de conídios de S. maydis e S. macrospora capturados no ar foi inversamente proporcional à distancia da posi o vertical e horizontal das armadilhas da fonte de inóculo. Os conídios foram capturados até uma altura de 2 m acima e distantes 120 m da fonte de inóculo. No entanto, em ambos experimentos, a freqüência e o número de esporos coletados foram maiores até 25 cm acima e 20 m distante da fonte de inóculo. Além disto, a dispers o dos conídios isolados ou agrupados no cirro, ocorreu livremente no ar, n o necessitando estarem veiculados a gotículas d'água.
Decomposi o dos restos culturais do milho e sobrevivência saprofítica de Stenocarpella macrospora e S. maydis
Casa Ricardo T.,Reis Erlei M.,Zambolim Laércio
Fitopatologia Brasileira , 2003,
Abstract: Em amostras de colmos de milho (Zea mays) coletadas em lavouras comerciais, conduzidas no sistema plantio direto, localizadas na Regi o do Planalto Médio do Rio Grande do Sul, no período de 1998 a 2000, determinou-se a sobrevivência saprofítica dos fungos Stenocarpella macrospora e S. maydis. Constatou-se que a presen a da palha de milho infetada na época de semeadura assegura a sobrevivência destes fungos e garante a presen a do inóculo para a cultura do milho. Nas avalia es feitas no ano de 1995, a decomposi o da palha do milho, mantida na superfície do solo, foi de 78,5% aos 29 meses após a exposi o no campo. Nas avalia es procedidas no ano de 1999, aonde foi comparado o efeito da posi o do resíduo cultural no solo, estimou-se que a decomposi o de segmentos de colmos infetados por S. maydis e S. macrospora mantidos na superfície do solo foi mais lenta do que quando foram enterrados. Apesar da freqüência dos picnídios de S. maydis e S. macrospora ter diminuído ao longo do tempo, a sua presen a foi detectada até 320 dias em colmos mantidos na superfície do solo. A viabilidade dos conídios de S. maydis e S. macrospora nos colmos mantidos na superfície do solo foi superior a 90%, após 320 dias de exposi o dos colmos no campo. Os resultados demonstraram que no sistema plantio direto a presen a da palha de milho infetada assegura a sobrevivência dos fungos S. maydis e S. macrospora.
Heran?a da resistência do Híbrido de Timor UFV 443-03 à ferrugem-do-cafeeiro
Capucho, Alexandre Sandri;Caixeta, Eveline Teixeira;Zambolim, Eunize Maciel;Zambolim, Laércio;
Pesquisa Agropecuária Brasileira , 2009, DOI: 10.1590/S0100-204X2009000300009
Abstract: the aim of this work was to characterize the resistance inheritance of the timor hybrid ufv 443-03 to coffee leaf rust (hemileia vastatrix). for this, the race ii and pathotype 001 of coffee leaf rust were inoculated in 246 f2 plants, 115 susceptible backcrossing (bcs) plants, and 87 resistant backcrossing (bcr) plants, derived from the crossing between the susceptible genotype 'catuaí amarelo' iac 64 and the resistance source timor hybrid ufv 443-03. for both inoculums, the 'catuaí amarelo' iac 64 was susceptible, while the timor hybrid, the plant representing f1 generation, and the bcr plants were resistant. the f2 plants inoculated with race ii presented two significant segregation ratios: 15:1 and 61:3. the resistance inheritance was verified by the inoculation of the bcs plants, which segregated at a 3:1 ratio, an expected pattern for the inheritance controlled by two genes, whereas the segregation hypothesis of 7:1 for three genes was rejected. two independent and dominant genes confer the genetic resistance of timor hybrid ufv 443-03 to race ii and pathotype 001 of h. vastatrix.
NOTE-Polymorphic information content of SSR markers for Coffea spp.
Robson Fernando Missio,Eveline Teixera Caixeta,Eunize Maciel Zambolim,Laércio Zambolim
Crop Breeding and Applied Biotechnology , 2010,
Abstract: Thirty-three coffee SSR primers from enriched genomic library with (GT)15 and (AGG)10 repeats were analyzedin 24 coffee tree accessions. Twenty-two primers were polymorphic among accessions; the number of alleles ranged from 2 to13, with the mean number of 5.1 alleles per primer. PIC values ranged from 0.08 to 0.79. The highest mean PIC values werefound for C. canephora (0.46), and the lowest values for C. arabica (0.22) and triploids (0.22) accessions. The polymorphicSSR markers used in this study were useful for genetic fingerprinting in the coffee tree, especially in the C. canephora and theleaf rust resistant arabica cultivars.
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