derrisn.

1860 G. Bentham in Jrnl. Linn. Soc. 4 Suppl. 21 Derris has the flat pod of Lonchocarpus, varying likewise in consistency from thin and membranous to thick and almost woody.

1860 G. Bentham in Jrnl. Linn. Soc. 4 Suppl. 22 I adopted for the whole genus Loureiro's old name, Derris, because I could clearly identify it with his character.

1936 D. H. Grist Outl. Malayan Agric. 182 Two species of derris are commonly cultivated in the Malay Peninsula.

1968 J. W. Purseglove Trop. Crops I. 257 Derris is propagated vegetatively by well-ripened stem cuttings.

1890 Pharm. Jrnl. & Trans. 21 559/2 Derris elliptica. This plant was stated to afford the most important of several drugs passing under the name of ‘tuba root’..a resinous body with an acid reaction, to which the name ‘derrid’ has been given... In the root it exists together with a brown colouring matter called ‘derris red’, derived from the tannin of derris.

1919 N. E. McIndoo et al. in Jrnl. Agric. Research XVII. 199 Derris, known widely as a powerful East Indies fish poison, was found to fulfill several of the requirements of a general insecticide; it acts both as a contact insecticide and as a stomach poison.

1919 N. E. McIndoo et al. in Jrnl. Agric. Research XVII. 200 Derris powder..was found to be efficient against dog fleas, chicken lice, house flies.

1932 R. F. Fortune Sorcerers of Dobu iii. 174 Derris, a vegetable poison in the roots of a tall liana, is used publicly for stupefying fish.

1936 Discovery Feb. 42/2 The successful derris treatments for Warble Fly damage.

1958 Times 25 Jan. 9/1 The derris will take care of the caterpillars and the BHC, of most of the other pests that afflict our plants.

1963 H. Martin Insecticide & Fungicide Handbk. i. 8 The other principal insecticide available prior to 1939 was derris, the ground root of species of the genera Derris and Lonchocarpus.

1971 Daily Tel. 3 Apr. 6/4 Don't forget the dustings of derris powder round their [sc. daffodil bulbs'] necks to scotch the maggots of the bulb flies.