Tuesday, September 11, 2007
Vertical distribution of Spodoptera frugiperda in Brazilian cotton crops
Dr. José E. Miranda, Embrapa, Rodovia BR 153 Km04 C.P.714, Goiânia, Brazil, Mr. João Batista dos Santos, EBDA, Rua Custódia Rocha de Carvalho, 152A, Barreiras, Brazil, and Ms. Kézia de A. Barbosa, Fundação GO, Alameda Zeca Valeriano, 2932 Parque Industrial Ipeguary, Santa Helena de Goiás, Brazil.
High population levels of Spodoptera frugiperda in cotton crops in Brazil occurs due to favorable climatic conditions, inadequate use of insecticides, and cotton succeeding grass crops. Studies on spacial distribution help to determine the right pest management. This work wants to determine the vertical distribution of S. frugiperda. Two acres blocks were demarcated where 20 plants were randomly inspected once a week, looking for presence of insects or injury. The number of eggs, caterpillars and damaged structures were registered. There were reduced number of mass eggs in the cotton plants, and the oviposition occured in sorghum plants cultivated nearby. The caterpillars were more widely distributed on medium and superior portions of cotton plants. The type of floral structure did not influence feeding preference. In plants with higher number of formed bolls (mostly present in the inferior portion), the injuries were higher. Samplings for determination of the population level must be done in medium portion of the plant during floral bud production stage, and in bolls present in the inferior portion after the opening flower stage.
See more of Arthropod Management Posters
See more of Arthropod Management
See more of The World Cotton Research Conference-4 (September 10-14, 2007)
See more of Arthropod Management
See more of The World Cotton Research Conference-4 (September 10-14, 2007)