Vol. 6, Issue 4, Part A (2019)

Author(s): Khalid FI Hassan, Nabil HH Bashir and Yousif OH Assad

Abstract: Makkah (western Saudi Arabia) is one of the endemic areas of dengue fever. The efficacy of outdoor Ultra-low Volume ( UL) with cyfluthrin 5% EW, and indoor thermal fogging (TF) with deltamethrin 2% EW as space spraying (SS), at the recommended and higher dose for controlling of Aedes aegypti were evaluated in Alsharayie area of the city, following WHO standard protocols. Bioassay tests for females were carried out for sugar- fed adults upon emergence (1-5) days. The efficacy of UL at different distances from the spray path (5, 15, 25, 40 and 50 m), and TF at 5 locations inside the house (center, corner, dark, window and hall) was also investigated. The data showed that the SS efficacy was significantly affected by the dose applied of pyrethroid. Tested distances from the spray path did not affect UL efficacy. Similarly, the locations of the cages indoor showed no difference on the performance of TF. However, it was observed that the TF efficiency was affected by the volume/size of the sprayed area, i.e. ≤20 m² inside the rooms (73.8 to 96.6 %), compared with ≥30 m² hall (57.7 to 79.7%). Regarding KdT, adults were rapidly knocked-down with UL (cyfluthrin) 29 min, when compared to TF (deltamethrin) 40 min. The results revealed that the LC₅₀ and LC₉₀ values for cyfluthrin against Ae. aegypti were 0.026 mg/L and 0.05 mg/L, respectively. While the respective values for deltamethrin were 0.008 mg/L and 0.015 mg/L. It can be concluded that the two pyrethroids are not effective at currently recommended doses SS against adult. Doses 300mg/L of cyfluthrin, and 160mg/L of deltamethrin proved to be more effective and recommended for the control of this vector.

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