Summers, C.G. and Coviello, R.L. and Pendery, W.E. and Bushing, R.W. (1976) Effect of sorghum midge on grain sorghum production in the San Joaquin Valley relative to date of planting and plant spacing. Hilgardia, 44 (6). pp. 127-140.
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Abstract
Populations of Contarinia sorghicola (Coq.) in the San Joaquin Valley, California, in 1972-74 persisted at low levels on Johnson grass (Sorghum halepense) from late spring to mid-summer. A slow build-up occurred on grain sorghum during early August, and numbers capable of causing severe reductions in yield were reached after about 20 August. Fields planted before 15 June are considered likely to escape damage, while those planted between 15 and 22 June may or may not escape damage, depending on the season. Virtually all plantings made after 22 June risk severe infestation and yield reduction. Plant population appeared to have little influence on ultimate yield. The yields in plots that were thinned to 13 and 26 plants/m were not significantly different from those thinned to 39 plants/m, although the midge infestation in heads from the low plant population was more than double that in heads from high plant population; plants in the low population produced larger heads and were able to tolerate much higher levels of infestation without suffering a loss in yield
| Item Type: | Article |
|---|---|
| Author Affiliation: | California Agricultural Experiment Station, Department of Entomological Sciences, California University, Berkeley, USA |
| Subjects: | Plant Protection |
| Divisions: | Sorghum |
| Depositing User: | Ms K Syamalamba |
| Date Deposited: | 20 Sep 2012 05:16 |
| Last Modified: | 20 Sep 2012 05:16 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/7996 |
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