8 BULLETIN 1201, TJ. S. DEPARTMENT OF AGRICULTURE. 



against Myzus persicae, Macrosiphum sp. C, silkworms, and the 

 lady-beetle tested, but inefficient against web worms and small tent 

 caterpillars. 



The alcoholic and benzene extracts of derris, when sufficiently- 

 strong and used with soap or kerosene emulsion, were found efficient 

 against many species of aphids (Tables 4 to 6). The alcoholic ex- 

 tract, used with soap, was efficient against half -grown sawfly larvae, 

 but inefficient against small web worms (first instar) and the larvae 

 and adults of potato beetles. 



At Tallulah, La., a commercial preparation of powdered derris 

 was used on three dogs which were infested with fleas (Ctenocephalus 

 canis Curt.). It was found efficient against the fleas. 



SANDBOXTREE. 



None of the six preparations of the sanclboxtree (Hura crepitans) 

 sprayed on aphids proved efficient (Table 8). A 10 per cent and a 

 20 per cent sap killed most of the aphids tested within three days, 

 but this reaction time is entirely too slow for practical purposes, 

 and even the sap 5 per cent and 10 per cent mixed with soap was 

 inefficient. The alcoholic extracts of the bark and sawdust were 

 inefficient, but the extract of the bark seems promising, and probably 

 a stronger mixture would have been efficient. 



TOMATO VINES. 



Powders from tomato vines (Lycopersicum esculentum), applied 

 as dusts, were ineffective on webworms, silkworms, potato-beetle 

 larvae, rose aphids, and tent caterpillars, but they had a considerable 

 effect on roaches; mixed with food, they had a slight effect on 

 grasshoppers and roaches and seemed efficient against flies (No. 11, 

 Table 1). Used as a fumigant, the powder was practically ineffective 

 against Myzus persicae. 



The water extracts from tomato vines had practically no effect 

 on bees and tent caterpillars, but affected grasshoppers and flies con- 

 siderably. The alcoholic and ether extracts were very effective on 

 flies and bees. 



CHINABERRY. 



The hot-water extract of the berries of the chinaberry (Melia azeda- 

 rach) and also of the undried berries was efficient against bees and 

 had a slight effect on roaches. The powdered leaves and water ex- 

 tracts (not filtered) from this powder were efficient against silk- 

 worms, but had only a slight effect on Aphis spp. A and B (Nos. 

 23k and 301a, Tables 2 and 3), and on tent caterpillars. 



The alcoholic, ether, and petroleum-ether extracts of chinaberry 

 were fatal to bees; but a strong alcoholic extract did not kill any 

 of the silkworms tested. The alcoholic and benzene extracts (Nos. 

 505 and 514, Table 4), used with soap were inefficient against Aphis 

 spp. A and B, Macrosiphum sp. A, and M. liriodendri. 



TOBACCO. 



The results obtained by using common tobacco (Nicotiana tahacum) 

 in the form of nicotine resinate and sulphate are as follows: About 

 90 per cent of the chrysanthemum aphids and 98 per cent of the nas- 



