MONITORING OF YIELD LOSS IN MAIZE CAUSED BY CHILO AGAMEMNON BLES. (LEPIDOPTERA : PYRALIDAE) | ||||
| Fayoum Journal of Agricultural Research and Development | ||||
| Article 14, Volume 19, Issue 1, January 2005, Page 150-155 PDF (419.47 K) | ||||
| Document Type: Research articles. | ||||
| DOI: 10.21608/fjard.2005.197806 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| Ibrahim M. Sabra; Mohamed S.I. Shalaby; Mahmoud M.I. Khewa | ||||
| Plant Protection Research Institute, Agricultural Research Center, Dokki, Egypt. | ||||
| Abstract | ||||
| A field trial was carried out in Fayoum Governorate, Egypt, in 2003 and 2004 seasons for monitoring yield loss in maize caused by Chilo agamemnon infestation. Based on data obtained from simulated and natural infestation using a given equation, yield loss could be estimated by field survey of the number of stems broken at different levels of the plants which compensate for the traditional method of dissecting the plants in search for the number of holes or larvae, in addition to the need for yield weight. The actual loss in yield was 1.59, 0.5 and 1.02 kg/200 plants in March, May and June plantations, respectively, compared to 1.44, 0.6 and 1.25 kg/200 plants estimated by the given equation. The differences between the actual and estimated loss in yield is not considerable. This finding ascertains that the use of such equation facilitates the assessment of C. agamemnon damage to maize plants through field observation of symptoms of infestation (broken stems only). Also, results showed that larvae bore into the ear shank and not the ear itself and confirmed that, the month of May is the suitable planting date for maize in Egypt. | ||||
| Keywords | ||||
| Chilo agamemnon; Equation; Maize; Yield loss | ||||
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