Evaluation of Fiprol, Imldaprid and Dueracide Insecticides against Larval Stage of Red Palm Weevil Rhynchophorus Ferrugineus (Olivier) in Makkah Al-Mukarramah Region

摘要

The red palm weevil, Rhynchophorus ferrugineus (Olivier) (Coleoptera: Dryophthoridae) is one of the most threatening pests for date palm trees in Kingdom of Saudi Arabia. It is considered as an insect pest from category I in the Gulf region and the Middle East, according to the Food and Agriculture Organization (FAO). The difficulty of controlling the weevil chemically is due to its hidden life habits inside the trunk of palm. The excessive use of large quantities of insecticides made it possess resistance against many of them. Therefore, it was important to carry out this research to investigate the level of sensitivity of weevil larvae against some common insecticides as used in Makkah AL Mukarramah region. The effectiveness of three pesticides was tested (Fiprol: cyclodines ;Imidaprid: neonicotinoid and Dueracide: organophosphate) through feeding and dipping techniques. The results revealed that Fiprol was the most effective against R. ferrugineus larvae where LC_(50) was (0.896-71.2 ppm) by feeding and dipping methods respectively. Then, Dueracide and Imidaprid were tested with LC_(50) of (54.2 -115.9 ppm), respectively. The LC_(50) of Imidaprid by dipping method showed (112.5 ppm) while the Dueracide was foundthe least effective by dipping treatment where the LC_(50) was (1003.8 ppm). According to the values of resistance ratio(RR),Fiprol was more effective than Dueracide and Imidaprid by (60.53 - 129.37) times respectively, by feeding method and about (1.57 and 14.68 ) times respectively, compared to Imidaprid and Dueracide by dipping. Generally, treatment by feeding was (59.58) times more effective than by dipping.