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Table 2 Resistance status of wild Anopheles arabiensis to pyrethroid and organophosphate insecticides

From: Long-lasting control of Anopheles arabiensis by a single spray application of micro-encapsulated pirimiphos-methyl (Actellic® 300 CS)

Insecticide

Dosage (%)

Number tested

Mortality (%)

P-methyl

0.025

40

98

P-methyl

0.05

40

100

P-methyl

0.25

40

100

Malathion

5

201

100

Permethrin

0.75

111

90

  1. Two- to five-day old sugar-fed offspring (F1) of Anopheles arabiensis collected from cattle-sheds in Lower Moshi were exposed for one hour in WHO cylinders lined with papers treated with diagnostic dosages of malathion and permethrin, and a range of dosages of p-methyl.