August, ’24] 
LOVETT: LIST OF PUBLICATIONS 
501 
tions of the same concentrate at 1 to 500 added to mosquito infested 
water killed 65% of the larvae but had no effect on the pupae. The pow¬ 
dered derris root (undiluted) sprinkled on the surface of the water killed 
90 per cent of the larvae in two to four hours. The same powder when 
dusted on aphids gave a 100% efficiency in eight hours and a 98% control 
of the larvae of Euphydryas chalcedona when dusted on the leaves upon 
which they were feeding. From these experiments it is judged that the 
active principle “derris” is both a stomach and a “respiratory” or tracheal 
poison. The reaction on the caterpillars must have resulted from inges¬ 
tion of the powder, since fumigating tests with the material gave negative 
results, while the fumigating action of the commercial derris extract 
was close to that of the toxicity curve for spraying. A check test on 
pyridine as a fumigant gave an efficiency of three and eight-tenths per 
cent. 
Tests on Animal Parasites 
Powdered derris root diluted to a twenty per cent concentration 
with calcium carbonate, as well as the commercial derris dusts, gave 
perfect control on the chicken lice ( Menopon biseriatum Prag. and 
Gonicotis gigas Tasch.) and the Giropid lice ( Gyropus cvalis Nitzsch 
and Gliricola porcelli Linn.) on the guinea-pig. The control of lice on 
large numbers of guinea-pigs is often a perplexing problem, especially in 
research work where perfect normality is desired for all experimental 
animals. Lice are especially difficult to control on young pigs and 
brood sows, the former often showing a high mortality. Powdered 
derris at twenty per cent dilution has given good satisfaction to the 
veterinarians at the University of California for this type of work, the 
powdered derris being applied to the birds by the pinch method of dust¬ 
ing on the infested areas. On the pigs, the powder was rubbed into the 
fur over the entire body or in treating pregnant sows the dust was 
applied behind the ears and on the back. 
PUBLICATIONS—A. L. LOVETT 
1911—Oklahoma Bui. 92, Spray Calendar. 
1913-14—2nd Biennial Crop Pest and Horticultural Report 1913-14. 
Variegated Cutworm, pp. 141-49. 
Rose Curculio, ( Rhynchites bicolor Fab.) injures Blackberry buds, pp. 150-53. 
The Radish Weevil, a New Pest ( Cleonus sparsus Lee.), pp. 154-56. 
Clover Seed Injury by Midge, Dasyneura leguminicola , pp. 157-59. 
Nematode gallworms or eelworms, Heterodera radicicola Mull., pp. 159-65. 
Tipulid work in Prune wood, Ctneophora angustipennis Loew, pp. 166-9. 
