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Occurrence of greenbug biotype K in the field

Occurrence of greenbug biotype K in the field

Journal of Agricultural and Urban Entomology uary; 18(1): 23-34

The success of managing greenbugs, Schizaphis graminum (Rondani), with plant resistance has been challenged by the repeated occurrence of resistance-breaking biotypes. Biotypes recognized as seriously damaging to sorghum, Sorghum bicolor (L.) Moench, hybrids are C, E, I, and K. In 1995, biotype K, which damages sorghum resistant to biotype I, was first identified in a biotype I greenbug colony being reared in the greenhouse. This colony originated from greenbugs collected in a field of wheat in Haskell County, Kansas, in April 1992, and was maintained on susceptible sorghum. Documenting the presence of biotype K in the field was imperative. Field samples of greenbugs collected from wheat and sorghum in Kansas and Oklahoma from 1996 to 1998 were identified to biotypes. These samples indicated that biotype I was the dominant biotype on both crops. Biotypes E and K were present in about 21 and 12% of the samples collected from sorghum in 1998, respectively. Biotype K was identified in samples collected from 11 counties in Kansas and 10 counties in Oklahoma during the sampling period. It is a potential threat to future sorghum hybrids that may rely on PI 550610 for protection against greenbug damage. Studies conducted at constant temperatures of 22, 27, and 32[degree]C indicated that biotypes C, E, I, and K had similar reproductive capacity and survival at 22 and 27[degree]C.

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Accession: 003513754

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