The potato a crop is attacked by many pests, among which the Diabrotica speciosa (Coleoptera: Chrysomelidae) is considered the main one. Because of chemical control failures associated with the requirements of integrated potato production (IPP) requiring sustainable measures, aimed to characterize advanced clones breeding program of Embrapa for resistance to insect infestation in artificial conditions. Tests were performed in a greenhouse without choice of plants and tubers of four clones of Embrapa (C2337-06-02, C2337-18-02, C2342-1-02, C2362-02-02), a standard-resistant clone (NYL 235-4) and a susceptible standard cultivar (Asterix). Results of susceptibility of 'Asterix' and resistance of 'NYL 235-4' and 'C2342-1-02', both in shoots and in tubers, predominated. Thus indicating a typical behavior of tolerance of 'NYL 235-4' and 'C2337-06-02' to insect attack, both in the shoots and in the tubers. Clones C2337-06-02 and C2362-02-02 which expressed resistance to the attack of the young stage of the insect in the tubers. Three potato genotypes derived from the wild species Solanum berthaultii (NYL 235-4, C2337-06-02, C2362-02-02) even under infestation of D. speciosa, showed agronomic traits determinants of greater commercial acceptance of tubers such as maintaining productivity, elongated, skin smoothness and shallower depth of the eye (vegetative bud).
The rice stem stink bug, Tibraca limbativentris Stål (Hemiptera: Pentatomidae), is one of the most harmful insects for Brazilian rice fields. Aiming to define the most appropriate time and place for pest management measures in commercial paddy fields, we adjusted regression models (Poisson, Zero Inflated Poisson, reparametrized Zero Inflated Poisson, Negative Binomial and Zero Inflated Negative Binomial) for modeling the population variation of T. limbativentris along the phenological cycle of the flooded rice cultivation. We hypothesize that the rice stem stink bug population’s size is influenced by the rice cycle (time) and geographical positions within the crop. It was possible to predict the occurrence of the rice stem stink bug in the commercial flooded rice crop. The population of the rice stem stink bug increased significantly with the time or phenological evolution of rice. Our results indicated that the start of T. limbativentris monitoring should occur up to 45 d After Plant Emergence (DAE), from the regions along the edges of the rice paddies, which are the points of entry and higher concentration of the insect. In addition, 45 and 60 DAE were considered the crucial times for T. limbativentris control decision making in flooded rice paddies.
Si im mp pó ós si io o d de e G Ge eo oe es st ta at tí ís st ti ic ca a A Ap pl li ic ca ad da a e em m C Ci iê ên nc ci ia as s A Ag gr rá ár ri ia as s 1 14 4 e e 1 15 5 d de e M Ma ai io o d de e 2 20 01 15 5 B Bo ot tu uc ca at tu u, , S Sã ão o P Pa au ul lo o IV Simpósio de Geoestatística em Ciências Agrárias -SGeA | Federal do Pampa/Campus de Itaqui, robson_a.b@hotmail.com 5 Engenheiro Agrônomo, Doutor, Pesquisador, Embrapa Clima Temperado, Caixa postal 403, CEP 96001-970, Pelotas, RS, Brasil, jose.martins@embrapa.brResumo -O objetivo do presente trabalho foi avaliar a influência de diferentes malhas amostrais na elaboração de mapas de probabilidade de ocorrência de Tibraca limbativentris, inseto conhecido por percevejo-do-colmo, em final da fase vegetativa da cultura do arroz irrigado por inundação na região do Planalto da Campanha do Rio Grande do Sul. O monitoramento do inseto ocorreu num talhão de lavoura de arroz de 13,7 ha, utilizando-se uma grade com 81 pontos georreferenciados e equidistantes 50 m. O número de percevejos somados nas fases de adultos e ninfas de cada ponto foi transformado, codificando os valores em zero (0) (ausência do inseto) e um (1) (presença do inseto). A partir da grade original do estudo, realizou-se a retirada de pontos a fim de se estabelecer outras configurações de malhas amostrais, sendo essas: 50 x 100 m, 100 x 50 m e 100 x 100 m. Realizou-se análise geoestatística via ajuste de semivariogramas e interpolação dos dados numéricos por krigagem ordinária. As malhas amostrais propostas geraram modelos diferentes de dependência espacial quando comparadas à malha original, sendo que a malha de 100 x 50 m apresentou concordância razoável com a malha original no mapeamento da probabilidade de ocorrência de T. limbativentris em arroz irrigado.Palavras-chave: percevejo-do-colmo; monitoramento; Oryza sativa.Abstract -The aim of this study was to evaluate the influence of different sample grids in the preparation of Tibraca limbativentris probability maps, insect known as rice stem bug, at the end of the vegetative phase of flooded rice field in "Planalto da Campanha" Region, Rio Grande do Sul (RS), Brazil. The insect monitoring occurred in 13,7 ha rice crops plot, using 81 points georreferenced grid and equidistant 50 m. The number of bugs summed at adult and nymph phases, of each spot, was transformed, encoding the values to zero (0) (insect absence) and (1) (insect presence). From original study grid, it was performed the removal of points in order to establish other sample grids settings, being these: 50 x 100 m, 100 x 50 m and 100 x 100 m. A geostatistical analysis was performed through semivariogram fitting and the interpolation of numerical data by ordinary kriging. The proposed sample grids generated different models of spatial dependence when compared to original grid, wherein the grid of 100 m x 50 showed reasonable agreement with the original grid in occurrence probability mapping of T. limbativentris flooded in rice field. IntroduçãoO percevejo-do-colmo do arroz, Tibra...
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