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 soghum. Annals of Applied Biology, 126 (1). pp. 131-142.
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Abstract
The mirid Calocoris angustatus is one of the most important pests of grain sorghum in India. Studies were conducted in Andhra Pradesh, India, to quantify the effect of damage by the mirid on grain quality and seedling establishment on 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. 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 damaged grain than in the undamaged grain, while the reverse was true for aspartic acid, methionine, leucine and lysine. 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. Damage by the mirid 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 mirid damage and determining economic thresholds
| Item Type: | Article |
|---|---|
| Author Affiliation: | International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Andhra Pradesh, 502 324, India |
| Subjects: | Plant Protection > Control Methods |
| Divisions: | Sorghum |
| Depositing User: | David T |
| Date Deposited: | 17 Jun 2011 03:24 |
| Last Modified: | 17 Jun 2011 03:24 |
| Official URL: | http://dx.doi.org/10.1111/j.1744-7348.1995.tb05009... |
| URI: | http://eprints.icrisat.ac.in/id/eprint/2191 |
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