Vol. 9, Special Issue 12, Part L (2025)

Field experiments were carried out to evaluate the efficacy of certain treatments against the Root melay bugs in 2021 and 2022. Five commercial formulated insecticides were used based on the Ministry of agriculture recommends for each insecticide to control sucking insects under field conditions. The root mealybug, Xenococcus Annandalei (Silvestri) was affected differently with the tested insecticides. Significant differences were found between the insecticides in their effects against the populations of nymphs during. After one week, these tests revealed that the most striking reduction in the populations of nymphs was achieved by mineral oil (75.20%) followed by spirotetramat (71.20%), thiamethoxam (60.50%), imidacloprid (59.21%) and V. lecanii (24.50%), respectively.  After four weeks, the used mineral oil and spirotetramat achieved the highest mean reduction percentages of the treated population exhibiting 81.39 % and 80.46% reduction, respectively. The least effective insecticide against the nymphs was V. lecanii as it caused 40.61% reduction in the treated population. During the sunset application, the highest population reduction of the nymphs after four weeks was achieved by the used mineral oil, which caused 95.44% reduction in the treated nymph population.  The least effective treatments during the sunset application were V. lecanii with 57.02% reduction and imidacloprid with 64.93% reduction, respectively in the treated adult population. The adult population reduction effects after the sunset application were achieved differently according to the tested insecticide as they were arranged in desending order as the following: the used mineral oil, spirotetramat, thiamethoxam, imidacloprid and V. lecanii as they respectively reduced the treated population with 86.15%, 85.10%,  76.21%, 71.15 % and 49.50% reduction in the same array.