Semiochemical modulation of oviposition behaviour in the gregarious desert locust Schistocerca gregaria

✍ Scribed by Torto, Baldwyn; Assad, Yousif O H; Njagi, Peter G N; Hassanali, Ahmed

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 64 KB
• Volume: 55
• Category: Article
• ISSN: 1526-498X
• DOI: 10.1002/(sici)1096-9063(199905)55:5<570::aid-ps950>3.0.co;2-7

✦ Synopsis

Penta¯uoroethyl reduces activity notably.

3.1.3 Combining ¯uorinated benzenesulfonamide with di-¯uoromethyltriazine (Fig 8)

After variation of the heterocyclic moiety from tri¯uoromethylpyrimidine to di¯uoromethyltriazine, tri¯uoromethyl as side chain on the benzenesulfonamide again leads to more active compounds than di¯uoromethyl. Both show good wheat selectivity. 3.1.4 In¯uence of new triazine substituents: CCIF 2 vs CF 3 (Fig 9)

However, chlorodi¯uoromethyl-and tri¯uoromethyltriazine are different, in that each combines better with an aromatic ester than with the ¯uorinated side chain. Selectivity in wheat is common to all.

4 CONCLUSION

Side-chain-¯uorinated pyrimidines, triazines and benzenesulfonamides are ideal building blocks for the research chemist. They offer chemical and biological ¯exibility for new sulfonylureas as postemergence herbicides. Selectivity in wheat and cotton is observed, best herbicidal activity being obtained up to the three-to four-leaf stage of the weeds. Selected compounds are undergoing broad ®eld tests in wheat.