EFFECT OF PLANT AGE AND CERTAIN WEATHER FACTORS ON THE POPULATION FLUCTUATIONS OF Earias insulana (BOISD) ON OKRA PLANT AND PRODUCTIVITY | ||||
| Journal of Plant Protection and Pathology | ||||
| Article 5, Volume 34, Issue 5, May 2009, Page 5251-5257 PDF (594.11 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jppp.2009.180974 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| Horia A. Abd El-Wahab1; Soad A. Ebrahim2; H. H. Shalabi1 | ||||
| 1Plant Protection Research Institute, (ARC). Dokki, Giza.Egypt. | ||||
| 2College of Environmental Agric. Sciences at El-Arish Suez Canal Univ. | ||||
| Abstract | ||||
| Field experiment was conducted at Qualubia Governorate during two successive seasons 2006and 2008 to study the population fluctuation of Earias insulana on two Okra varieties. In addition, to study the effect of certain weather factors (daily mean temperature, daily mean R.H.) and plant age on the two Okra cultivars during two seasons. The obtained results showed that: the number mean of E. insulana started to occur on July27th and increased gradually reaching the peak in September 14th or plant age (163 days from sawing). The high number of larvae was recorded (7.8 & 6.3 larvae/10pods and 7.7 &6.8larvae/10pods) during the first and second seasons on the Okra varieties (Eskandarani and Balady), respectively. The weather factors (mean Temp. and plant age) had significant effect on population of E. insulana larvaewith two varieties (Eskandarani and Balady) also the relative humidity had negative significant effect on population of E. insulana during two successive seasons 2006 and 2007 on two cultivars, respectively. The percentage of variance explained by three tested factors during two seasons, was 52.6&52.0 % and (89.7 and 95.4%) for the two Okra varieties, (Eskandarani and Balady), during two seasons respectively. Balady variety gave the highest yield, then Eskandarani variety during two seasons respectively. | ||||
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