Wilson, A.G.L. (1976) Varietal responses of grain sorghum to infestation by Heliothis armigera. Experimental Agriculture, 12 (3). pp. 257-265.
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Abstract
In field-plot tests on Heliothis armigera (Hb.) on sorghum in the Ord River Valley in the north of Western Australia in 1971-73, oviposition, larval numbers, and grain damage were investigated in 3 varieties of sorghum with different head densities. The total numbers of eggs laid were similar in the 3 varieties, but larval infestation was higher in a very dense-headed variety (Pickett 932045) than in a semi-dense headed one (RS610) and an open-headed one (E57). Greater losses per larva were estimated with varieties E57 and Pickett 932045 than for RS610, where lesser susceptibility was associated with ability to compensate, mainly by increased grain size, for grain loss. There was some evidence that infestation might be adequately controlled by natural enemies (including Trichogramma australicum Gir. and Microgaster sp.) when chemical control of other pests (including locusts) is not necessary, and where spray drift from other crops does not occur. Where chemical control is necessary, the precise timing of application in relation to hatching of the eggs is important.ADDITIONAL ABSTRACT:In trials in 1971-3 in the Ord River valley, N. Western Australia grain damage by H. armigera was studied in 3 sorghum cultivars of different panicle densities. Larval infestation was highest on (a) the very dense-panicled cv. Pickett 932045 and was similar in (b) the semi-dense-panicled cv. RS610 and (c) the open-panicled cv. E57. Grain losses/larva were 5.4, 7.9 and 8.4, in (b), (c) and (a), respectively. Mean grain yield losses of untreated plots compared with those given applications of endosulfan or Orthene [acephate] were 93.8, 132.8 and 148.3 g/m2 in (b), (c) and (a), respectively. In 1971-2, grain yield loss in untreated plots was significantly less in (b) than in (a) or (c). 100-grain weight in (a) and (c) was similar in untreated plots and those given pesticides, but was higher in untreated than treated plots in (b).ADDITIONAL ABSTRACT:In trials in 1971-3 in the Ord River valley, N. Western Australia grain damage by H. armigera was studied in 3 sorghum cultivars of different panicle densities. Larval infestation was highest on (a) the very dense-panicled cv. Pickett 932045 and was similar in (b) the semi-dense-panicled cv. RS610 and (c) the open-panicled cv. E57. Grain losses/larva were 5.4, 7.9 and 8.4, in (b), (c) and (a), respectively. Mean grain yield losses of untreated plots compared with those given applications of endosulfan or Orthene [acephate] were 93.8, 132.8 and 148.3 g/m2 in (b), (c) and (a), respectively. In 1971-2, grain yield loss in untreated plots was significantly less in (b) than in (a) or (c). 100-grain weight in (a) and (c) was similar in untreated plots and those given pesticides, but was higher in untreated than treated plots in (b)
| Item Type: | Article |
|---|---|
| Author Affiliation: | Kimberley Research Station, Kununurra, West Australia |
| Subjects: | Crop Improvement > Genetics/Genomics Crop Improvement > Plant Breeding |
| Divisions: | Sorghum |
| Depositing User: | Ms K Syamalamba |
| Date Deposited: | 12 Jul 2012 10:47 |
| Last Modified: | 12 Jul 2012 10:48 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/6720 |
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