Effect of host plant resistance and chemical control of the head bug, Calocoris angustatus Leth., on grain quality and seedling establishment in sorghum.

Sharma, H C and Soman, P and Subramanian, V (1995) Effect of host plant resistance and chemical control of the head bug, Calocoris angustatus Leth., on grain quality and seedling establishment in sorghum. Annals of Applied Biology, 126 (1). pp. 131-142. ISSN 0003-4746

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The sorghum head bug, Calocoris angustatus Lethiery (Hemiptera: Miridae), is one of the most important pests of grain sorghum in India. Studies were conducted to quantify the effect of head bug damage on grain quality and seedling establishment on head bug-resistant cultivars (IS 17610 and IS 21443), a moderately susceptible cultivar (IS 9692), and a susceptible commercial cultivar (CSH 11). Differences in 1000-grain mass, seed germination and percentage of floaters were significant between protected and unprotected plots in CSH 11 and IS 9692, but not in IS 17610 and IS 21443. Grain damage ratings were significantly lower in IS 17610 than in IS 9692 and CSH 11 across different protection levels.Head bug-damaged grain had greater protein content than the undamaged grain, possibly because of depletion in starch, and a marginal increase in soluble sugars. Amounts of proline and tyrosine were greater in the bug-damaged grain than in the undamaged grain, while the reverse was true for aspartic acid, methionine, leucine and lysine. Head bug damage also increased the tannin content in IS 9692 (which is a high-tannin genotype).Moisture regimes and insecticide protection levels significantly affected seedling emergence. Seedling emergence of CSH 11 was lower than that in IS 17610. In the latter genotype, the differences between protected and unprotected plots were not significant. Head bug damage thus not only leads to quantitative loss in grain yield, but also spoils the grain quality and renders the grain unfit for seed purposes. These qualitative effects should be taken into account while estimating losses due to bug damage and determining economic thresholds.

Item Type: Article
Uncontrolled Keywords: Calocoris angustatus, mirid, sorghum, germination, grain quality, seedling establishment, host-plant resistance
Subjects: Mandate crops > Sorghum
Depositing User: Mr Sanat Kumar Behera
Date Deposited: 10 Oct 2011 06:08
Last Modified: 10 Oct 2011 06:08
URI: http://oar.icrisat.org/id/eprint/2087
Official URL: http://dx.doi.org/ 10.1111/j.1744-7348.1995.tb0500...
Acknowledgement: We thank Mr. V V rRao, Mr N Sambasiva Rao, Mr G Venkateshwarlu and Mr Jayachandran for their help in these studies, dr P K Mukherji, Dr K F Nwanze and Dr D E Byth for constructive comments, and Mr I Krishna Murthy for typing the manuscript. The paper was approved as J. A. No. 1490 by the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Andhra Pradesh 502 324, India
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