Karem M. Mohanny(1) Ahmed M. M. Ebieda*(2) Ghada S. Mohamed(1) Refaat O.H. Allam(1) and Marwa A. A. Sadan(2)
(1). Plant Protection Department, Faculty of Agriculture, South Valley University, Egypt.
(2). Sugar Crops Research Institute, Agricultural Research Center, Giza, Egypt.
(*Corresponding author: Dr. Ahmed M. M. Ebieda. E-Mail:ahmedebieeda@yahoo.com).
Received: 24/08/2020 Accepted: 15/10/2020
Abstract
The current work was carried out at the El-Mattana Agricultural Research Station, Luxor Governorate during the 2016/17 and 2017/18 seasons to assess the best possible expression to S. sacchari (SS)infestation and its population ecology. Six promising sugarcane cultivars were utilized. Six infestation techniques of SS were applied (i.e. Population density (PD), infested internode numbers (IIN), IIN %), infested stalk numbers (Isn), Isn % and infestation index (II)). For determination PD, nymphs, females, adult females and all stages were detected to select the best expression for PD. All stages of SS per 10 plants were used because the females and the adult females were small numbers. The population ecology of SS is changed, now sexual dimorphism not available because the male is absent but the parthenogenetic mode of reproduction is only observed in Egypt. Sep had the highest rates of infestation across two seasons. The largest ranges for nymph & all stages were between 15 Aug and 15 Dec and for females and adult females between 15 Aug and 1 October. G3 and GT54-9 were highly sensitive and G4 had a high tolerance. At the same time, the grades G48-47, G2003-44 and G 99-103 are moderately susceptible to SS infestation. The cultivars being tested as well as the seasons varied greatly in their susceptibility to S. sacchari based on the various their properties or seasons. The comparing correlations between climatic parameters and infested techniques revealed that the best expression for SS to infest sugarcane was IIN%, Isn and Isn%.
Key words: Sugarcane, Saccharicoccus sacchari, Population ecology.
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