Two hundred and thirty seven chemicals were tested to determine their effect on the germination of Orobanche aegyptiaca and Striga hermontheca. From their activity in these tests and a knowledge of their general properties the following are regarded as being the most promising for the pre-em. control of (1) Orobanche — oryzalin, dichlobenil, chlorthiamid, nitralin and chloramben. (2) Striga — 2, 4-D, MCPA and a range of other phenoxy compounds, chlorfenac, with MON 097, prynachlor, PH 40–21, PRB-8, RU 12068 and U 27658 showing the most interesting activity among the newer compounds.
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Kasasian et al. (1971) studied this question.