Seasonal Abundance of Icerya aegyptiaca (Douglas) on Mandarin Trees and its Associated Predators at Giza Governorate | ||
| Journal of Plant Protection and Pathology | ||
| Article 7, Volume 12, Issue 2, February 2021, Pages 125-129 PDF (841.49 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jppp.2021.154399 | ||
| Author | ||
| Samah M. Y. Helmy* | ||
| Plant Protection Research Institute, Agricultural Research Center, Giza, Egypt | ||
| Abstract | ||
| The present work was carried out in Giza Governorate to study the seasonal abundance of the Egyptian mealybug Icerya aegyptiaca (Douglas) (Coccoidea : Monophlebidae) during (2016-2017) which attacking mandarin trees Citrus reticulata Blanco (Rutaceae) and its main associated predatory insects. Also, study effect of biotic and abiotic factors on the seasonal abundance of its stages. The obtained data showed that, nymphs, adult females, ovipositing females and the total population of I. aegyptiaca recorded three peaks on mandarin trees during (2016 -2017). These peaks of total population of I. aegyptiaca, occurred on June, August and December. The highest peak recorded in 15th August (2016 -2017).The results revealed that, three peaks were recorded for Rodolia cardinalis (Mulsant) (Coleoptera: Coccinellidae) and Chrysoperla carnea (Steph.) (Neuroptera: Chrysopidae), during the two successive years of study. Simple correlation coefficient indicated that, the relationship between I. aegyptiaca and its associated predators assured that, a highly positive significant effect during (2016-2017). The temperature showed a positive significant effect on the population of I. aegyptiaca. The common effect of biotic and abiotic factors was 90.56% and 92.92% of the nymph stages, adult females was (87.11% & 88.36%), ovipositing females was (94.16% & 90.09%) and total populations was (94.16% & 84.35%) during (2016-2017). | ||
| Keywords | ||
| seasonal abundance; Egyptian mealybug; Icerya aegyptiaca; Rodolia cardinalis; Chrysoperla carnea. Mandarin trees | ||
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