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Effect of greenbug, Schizaphis graminum (Rondani) (Homoptera : Aphididae), biotype K on chlorophyll content and photosynthetic rate of tolerant and susceptible sorghum hybrids


Effect of greenbug, Schizaphis graminum (Rondani) (Homoptera : Aphididae), biotype K on chlorophyll content and photosynthetic rate of tolerant and susceptible sorghum hybrids



Journal of the Kansas Entomological Society 75(4): 299-307



ISSN/ISBN: 0022-8567

Greenbug, Schizaphis graminum (Rondani), (Homoptera: Aphididae), biotype K feeding reduced the chlorophyll content and photosynthetic rate on both resistant ('Cargill 607E') and susceptible ('NC + 272') sorghum hybrids. Greenbugs caged on a 5 cm x 2.5 cm area on the newest fully expanded leaves for one day caused greater reduction of photosynthetic rate and chlorophyll content loss in the susceptible line compared to the resistant line. The resistant hybrid recovered more rapidly than the susceptible hybrid over a 10-day observation period. However, high levels of four day feeding damage caused a drastic decrease in chlorophyll content and photosynthetic rate in both resistant and susceptible hybrids and little recovery was recorded, Thus, 'Cargill 607E' was physiologically tolerant to greenbug feeding at low levels of infestation. These data could be helpful in predicting yield losses if the relationship between photosynthetic rate and yield is well understood.

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Accession: 070555102

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