Screening Brachiaria introductions for resistance to spittlebugs (homoptera: cercopidae).
2001
VALERIO, J. R. | VALLE, C. B. DO | SOUZA, A. P. DE | OLIVEIRA, M. C. M. | JOSE RAUL VALERIO, CNPGC; CACILDA BORGES DO VALLE, CNPGC; A. P. DE SOUZA, CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO; M. C. M. OLIVEIRA, EMPRESA MATO-GROSSENSE DE PESQUISA, ASSSISTÊNCIA E EXTENSÃO RURAL.
Spittlebugs are the most evident and damaging pests of signal grasses (Brachiaria) in tropical America. Damage cause by these insects can result in the complete loss of available forage, thereby reducing the carying capacity of infested pastures. Host plant resistance is a low-cost method of controling insects. High level of spittlebug resistance is found in the cultivar Marandu (B. brizantha), but it requires more fertile soils. Brachiaria germplasm provided by the International Center for Tropical Agriculture (CIAT) is available at National Beef Cattle Research Center of the Brazilian Agricultural Research corporation (Embrapa Beef Cattle) and it is being screened for spittlebug resistance. In the present study, 23 introductions of Brachiaria were evaluated for resistance to the spittlebug Deois flavopicta, based on the parameters: nymphal perid. The introductions CIAT 16125 and CIAT 16309, both B. brizantha, were selected as resistant in this test.Given the great number of availalble introductions and hybrid, tests like this have been conducted routinely at Embrapa Beef Cattle. A total of 551 introductions and hybrids have already been screened in the past few years. As a result 40 introductions and 11 hybrids were found resistant. The aim of continuing evaluations is to release new spittlebug resistant Brachiaria cultivars.
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