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Published online by Cambridge University Press: 19 September 2011
The LC50 values (% active ingredient in parentheses) for 34 formulations of 29 insecticides, obtained by dipping green berries (GWB) infested with adult Hypothenemus hampei, were: thiodan EC 35 (0.0003) > perfekthion (0.0004) > carbicron (0.00044) > decis (0.0005) > actellic (0.0008) > basudin (0.0009) > belmark and ciodrin (0.0012) > thiodan EC 3 (0.0013) > malathion (0.0014) > folimat and bidrin (0.002) > aldicarb and lindane (0.003) > nexion > tiovel EC 3 > dursban (0.0046–0.006) > supona > methomyl > kelthane (0.011–0.012) > chlordane > aldrin > dimilin > chlorfenvinphos > phosdrin > sevin > methoxychlor > dieldrin (0.016–0.025) > nexagan (0.034) > azodrin (0.04) > fenitrothion (0.07) > bimarit (0.14) > chlorpyrifos (0.39) > gardona (0.96).
The order of toxicity remained the same for borers in the pulp (GP) or endosperm (GE) of green berries or endosperm of red (RE) berries, though the LC50 of each formulation of the same or different insecticides varied significantly. The respective LC50 values for the four leading, and the rest of the formulations were about 7−21- and 2−6-fold higher in GWB than GP, 9−23 and 2−5-fold higher in GE than GP, 1−2.3- and 1−3-fold higher in RE than GE, and 12−25- and 3−37-fold higher in RE than GWB. The practical significance of the results is discussed.