Spatial Distribution Pattern and Population Density of Rhopalosiphum padi L. (Hemiptera: Aphididae) and its Effect on the Yield of Some Wheat Cultivars and Lines under Upper Egypt Conditions
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- Aphids, Wheat Cultivars, Rhopalosiphum padi, Population Abundance, Spatial Distribution
- Bakry, Moustafa M. S.; Mohiy, M. M.; Abdel-Baky, Nagdy F
- Field experiments were conducted at El-Mattana Agricultural Research Station, Luxor Governorate, Egypt during two successive growing seasons (2017/2018 and 2018/2019) to study the response of some wheat lines and cultivars to infestation by Rhopalosiphum padi L. (Hemiptera: Aphididae) and their spatial distribution pattern. As well, studying the relation between the infestation and yield of different wheat lines and cultivars. Results indicated that the total population density of R. padi during the first growing season (2017/2018) was higher than second growing season (2018/2019). As well, the mean total R. padi population through the whole season was 48.04 ± 1.26 and 22.74 ± 0.55 individuals per 10 tillers over first and second growing seasons, respectively. The obtained results indicated that Giza 171 and Giza 12 cultivars and, lines of wheat (6, 11 and 13) were the highly susceptible varieties (HS) during the two seasons. On the other hand, Shandwel 1 and Sides 14 cultivars and lines 4 and 12 were rated as resistance to infestation (R) during the two seasons, these cultivars and lines of wheat plants should be promoted in the areas of high aphid infestation. It was also, noticed that the mean maximum population density of R. padi was observed on Giza 171 cultivar, while, the minimum individuals of population were recorded on line 4 of wheat plants through the two growing seasons. Data were analysed using distribution indices. All distribution indices indicated a significant aggregation behaviour during each growing season in all the tested wheat cultivars and lines. It was clear that the reflection of the insect infestation levels in all tested wheat cultivars and lines on the yield and its component was negatively and highly significant. Meaning, whenever increase infestation rates by pest, would decrease the studied measurements of yield (negative relationship). Furthermore, the distribution and different wheat genotypes presented here could be used as a tool for future research on pest management methods for this pest in this area ecosystem.
Full text: IJRAS_927_FINAL.pdf