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URI permanente desta comunidadehttps://thoth.dti.ufv.br/handle/123456789/3352
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Resultados da Pesquisa
Item Evaluation of a prototype of soil thermal solarizer for control of gall nematode in the production of coffee seedlings(Universidade Federal de Lavras, 2023-02-23) Uchôa, Francisco Paiva; Vieira Junior, José Roberto; Fernandes, Cléberson de Freitas; Rocha, Rodrigo Barros; Espíndula, Marcelo Curitiba; Rudnick, Vaneide Araújo de Sousa; Silva, Dvany Mamedes da; Freire, Tamiris Chaves; Sangi, Simone Carvalho; Mariobo, Solange Aparecida RodriguesIn coffee crops at Rondônia State of Brazil, there is an increase in phytonematode epidemics.Since most local coffe nurseries at Rondônia use soil as substrate for seedling production, this work aimed to test the minimum exposure time at 60 ºC to control of root-knot nematodes Meloidogyne incognita in soil by means of solar heating, using a solarizer, in an adapted version for better heating perfomance. The used solarizer prototype was built of a wooden box covered with metal sheets, thermal blankets, painted black, with aluminum pipes of 0.5 cm in diameter at the bottom of the box that circulates the water heated by the collector box. The soil was inoculated with a suspension of 1000 eggs + J2 of M. incognita per liter and placed in equipment with a capacity of 150 liters. Exposure times at a minimum temperature of 60 °C were evaluated, with 14 treatments: C1 (non-inoculated and not autoclaved), C2 (inoculated), C3 (non-inoculated and autoclaved) T0’, T15’, T30’, T45’, T60’, T180’, T360’, T720’, T1440’, T2880’ and T4320’ . The temperature was measured every 15 minutes using a skewer-type digital thermometer. The soil was removed according to the exposure time, and placed in 8-liter pots, in which clone 125 and BRS 2357 coffee seedlings, susceptible to M. incognita , were transplanted and growing in a greenhouse for 180 days. The experimental design used was DIC, with 6 replications, each seedling as na experimental unit. Reproduction factor (FR), number of eggs per plant (NOGR) and number of galls per gram of root (NGGR) were evaluated. The FR, NOGR and NGGR variables reduced with exposure time. All treatments showed an effect to control the population of M. incognita in infected soils, with 100% efficacy of pathogen eradication from the T45’ treatment, 60 minutes of exposure is recommended for the production of Coffea canephora seedlings. Taken together, thir work showed the high potential of thr solorizer to contribute in the root-knot nematode control to seedling production.Item Pathogenicity of Meloidogyne spp. (Tylenchida: Meloidogynidae) from Brazil and Central America on two genotypes of Coffea arabica(Sociedade Brasileira de Fitopatologia, 2008) Carneiro, Regina M.D.G.; Mesquita, Luiz F.G. de; Gonçalves, Wallace; Pereira, Antônio A.Entre as espécies de nematóides de galhas mais danosas ao cafeeiro, Meloidogyne exigua, Meloidogyne paranaensis, Meloidogyne incognita, Meloidogyne arabicida, Meloidogyne izalcoensis e Meloidogyne mayaguensis são as que causam os maiores problemas em áreas de cultivo de café no Brasil e países da América Latina. A reação de resistência a essas seis epécies foi estudada na progênie H419-5-4-5-2, obtida do cruzamento artificial entre cultivar Catuaí Amarelo IAC 30 com a seleção de Híbrido de Timor UFV 445-46.Item Risk analysis of climate change on coffee nematodes and leaf miner in Brazil(Empresa Brasileira de Pesquisa Agropecuária - Embrapa, 2008-02) Ghini, Raquel; Hamada, Emília; Júnior, Mário José Pedro; Marengo, José Antonio; Gonçalves, Renata Ribeiro do ValleThe objective of this work was to assess the potential impact of climate change on the spatial distribution of coffee nematodes (races of Meloidogyne incognita) and leaf miner (Leucoptera coffeella), using a Geographic Information System. Assessment of the impacts of climate change on pest infestations and disease epidemics in crops is needed as a basis for revising management practices to minimize crop losses as climatic conditions shift. Future scenarios focused on the decades of the 2020’s, 2050’s, and 2080’s (scenarios A2 and B2) were obtained from five General Circulation Models available on Data Distribution Centre from Intergovernmental Panel on Climate Change. Geographic distribution maps were prepared using models to predict the number of generations of the nematodes and leaf miner. Maps obtained in scenario A2 allowed prediction of an increased infestation of the nematode and of the pest, due to greater number of generations per month, than occurred under the climatological normal from 1961–1990. The number of generations also increased in the B2 scenario, but was lower than in the A2 scenario for both organisms.Item Avaliação da resistência dê cafeeiros às raças dê Meloidogyne incognita(Instituto Agronômico (IAC), 1987-01) Lordello, Rubens Rodolfo Albuquerque; Lordello, Ana Ines LucenaNo Centro Experimental de Campinas do Instituto Agronômico, de abril de 1984 a agosto de 1985, realizaram-se dois experimentos, em vasos, para avaliar a resistência de mudas de sete linhagens de Coffea arabica ('Mundo Novo': CP388-17, CP379-19, CP501 e MP376-4; 'Catuaí Amarelo' H2077-2-5-62 e 'Catuaí Vermelho' H2077-2-5-81, e 'Caturra Amarelo') e dois de C. canephora (Robusta: 'Guarini' col. 10 e 'Kouillon' col. 67-14) às quatro raças de Meloidogyne incognita. No primeiro experimento, cada muda foi infestada com 8.000 ovos, passados cinco meses do transplante, e a avaliação, efetuada seis meses depois. No segundo experimento, as mudas foram infestadas cerca de um ano do transplante com 7.000 ovos cada uma e a avaliação realizada decorridos dez meses. Todas as plantas foram infestadas pelas raças 1 e 2; entretanto, a reprodução do nematóide foi menor nas plantas mais velhas. As raças 3 e 4 apresentaram baixas infestações e algumas reações de imunidade, principalmente a 4, que tem pouca importância prática pela sua pequena ocorrência. Os cultivares de Catuaí revelaram médias de notas de ootecas menores que as das linhagens de 'Mundo Novo', indicando menor suscetibilidade. Contudo, é importante ressaltar que a menor infestação não significa que as raças 3 e 4 sejam menos danosas ao cafeeiro quando o parasitam em campo.