Herbicidal Activity of IIIJ

As shown in Table 4.25, all IIIJ had 50 % pre-emergence activity against wheat, crab grass, barnyard grass, and rape. IIU-4 and IIU-6 displayed 90 % inhibitory effect against cucumber, lettuce, or setose thistle, and IIIJ-2 showed 90 % inhibitory effect against setose thistie in pre-emergence application at 2.25 kg ai/ha. 

Inhibitory potency (%) against the growth of plants at a rate of 2.25 kg ai/ha in the greenhouse was expressed as four scales—k . 90-100 %, B 75-89 %, C 50-74 %, D 50 %, and NT not tested Tri wheat Dig crab grass Ech barnyard grass Bra rape Cue cucumber Lac lettuce Cir setose thistle 

Among the tested IIU, IIU-4 seemed to have better pre- and post-emergence activity than other compounds at 2.25 kg ai/ha. 

A series of (9-methyl [l-(5-methylisoxazol-3-yloxyacetoxy)alkyl]methyl phosphi-nates IIIJ including eight compounds was synthesized by condensation of (9-methyl (1-hydroxyalkyl)methylphosphinates M12 with 5-methylisoxazol-3-yl-oxyacetyl chloride M16 in 33-65 % yields. 

Baillie AC, Wright K, Wright BJ et al (1988) Inhibitors of pyruvate dehydrogenase as herbicides. Pest Biochem Physiol 30 103-112 

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