Abstract
Ten cotton-producing countries in sub-Sahara French-speaking African have adopted ULV spraying and by 1985, 97% of the area protected was sprayed using this technique. Compared with knapsack spraying with horizontal booms, ULV sprays gave rise to an equivalent yield of seed cotton, with better or similar bollworm control. In the Ivory Coast, plant coverage obtained by ULV sprays at 3 1/ha with one pass every six rows is insufficient, so a four-row swath with the same amount of insecticide or an increase to 4 or 5 1/ha is recommended late in the season. ULV sprays at 1 1/ha reduce financial expenditure by 15–20% and are used in Cameroon and partly in Chad. This technique may be less effective against certain sucking insects, particularly Polyphagotarsonemus latus in luxuriantly growing cotton.
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