Field experiments were conducted at wheat program of El-Mattana Agricultural Research Station, Luxor Governorate, Egypt during two successive growing seasons (2017/2018 and 2018/2019) to study the performance of some wheat cultivars and lines to infestation by Schizaphis graminum (Rondani) (Hemiptera: Aphididae) and their spatial distribution pattern. Results indicated that the total population density of S. graminum during the first growing season (2017/2018) was higher than second growing season (2018/2019). Also, the total mean of S. graminum population through the whole season was 20.83 ± 0.54 and 13.57 ± 0.34 individuals per 10 tillers over the 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 S. graminum 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 21 distribution indices. All distribution indices indicated a significant aggregation behaviour during each growing season in all the tested wheat cultivars and lines. These pieces of information can be useful for planning an IPM program of aphid on wheat plants.
A field study was carried out at a private mango orchard at Abu-Suwair district in Ismailia Governorate, Egypt during two successive years from (January 2018 to December 2019) to study the performance of some mango varieties to infestation with the mango shield scale, Milviscutulus mangiferae (Green) (Hemiptera: Coccidae). The obtained results showed that insect population of M. mangiferae occurred on all different mango varieties all the year round and has three peaks of seasonal activity per year, which was recorded in January, June/July and November over the year. The obtained results indicated that the mango varieties varied significantly in their susceptibility to population density of M. mangiferae. Ewaise mango variety was the highest population density and was rated as highly susceptible (H.S.) to infestation by the total population density of M. mangiferae, followed by Zebda and Fagri Kalan mango varieties were appeared as susceptible (S), while, Balady variety was observed to be relatively resistant (RR). But, Sakary variety had the lowest population density and was rated as relative resistant (RR) of pest over the entire year. These pieces of information can be useful for establishing IPM strategies against this pest.
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