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CARRASQUILLA, H. T. (3026) 
1923. FUNGICIDES E INSECTICIDES IviAS USADOS PARA COiv BATIK LAS ENFERkEDADES 
DE LAS PLANTAS Y DE LOS INSECTOS. Colombia toiru Indus. Dept. de 
■Nogocios Gen. Kept. , Circ. No. 1, 3 pp. Bogota. 
The following spray mixture is recommended in Colombia, S. A.: 
3 kg. tobacco (leaves or powder), 200 g. sodium carbonate, and 100 1. 
water (p. 2) . 
KINDSHOVEN (2027) 
1925. INSECT PESTS OF TRUCK CROPS AND THEIR CONTROL. Flugbl. Deut . 
Landw. Gesell. No. 91, pp. 1-4. [in German.] 
The following mixture is recommended in Germany as a contact 
spray for general purposes against sucking insects: 2 1. tobacco 
extract (8 to '10 percent nicotine content), 2 kg. soft soap, and 
100 1. water. Homo-made tobacco extract may be obtained by boil- 
ing chopped tobacco leaves and letting them soak for 24 hours (p. 4) . 
VELITSHKEVITSH, A. (2028) 
1928. INSECTS NUISI3LES A L'OIGNON DANS LE GOUVERNEkENT DE NOVGOROD. 
Defense des Plantes 4 (4-5): 717-728. [in Russian with a 
French title.] 
Against insects infesting onions spray., " . containing 5 
drops of tobacco extract to a glass of water, is recommended in 
Russia. 
CLARK, S. 17. (2029) 
1929. INSECT PESTS AFFECTING COMMERCIAL CROPS IN THE LOT/EH RIO GRANDE 
VALLEY. Jour. Econ. Ent. 22 (5): 789-792. [Abstracts in 
Biol. Abs. 6 (10): 2329. Entry 22643. 1932.] 
Bean le'afhoppors are controlled by bordeaux-nicotine spray: 
cabbage aphid and looper, by nicotine- soap and arsenical s. 
Harlequin bugs, onion thrips, and aphids are not satisfactorily 
controlled by nicotine dusts because of high winds and rainy seasons. 
NABOKOV, Y. A. (2030) 
1929. NOUVEL APPAREIL CO;. BINE POUR LA DESINFECTION ET DESINSECTISATION. 
Russ. Jour. Trcp. Med. 7 (3): 350-536. [in Russian with French title. 
Abstract in Rev. Appl. Ent. (B) 18: 80. 1930.] 
Sulphur or tobacco dust is burned in three shallow dishes 
fixed inside the cylinder one above the other, the twe upper ones 
having a wide opening in the center to allow the fumes from the 
bottom dish to ascend. A pipe carries the gas into the place to 
be fumigated, thus avoiding the risk of fire. 
