- 6 - 
Diacrisia luTsricipeda (L. ) 
Van der Laan (244) in 1936 reported that th.i-s species -was not 
affected by derris. 
Diacrisia subcarnea (Walk. ) . . 
The Institute of Physical and Chemical Research ( 214 ) , Tokyo, 
Japan, in 1927 reported that Neoton at 300 gin. plus 750 gm. of 
soap per 40 imperial gallons of water gave 100-percent mortality 
of the larvae of this species. 
Estigmene acraea (Drury), the salt-marsh caterpillar 
-Finch et al. (l_33_) in 1939 recommended derris preparations 
for control on grapes in Arizona. 
Tyria jacobacae (L. ) . . 
Craufurd-Benson (85) in 1938 reported that for testing derris 
insecticides by his dipping method (Bui. Hit. Sss. 29;4l) many 
insects are unsuitable. Cinnabar moth larvae, T yri a ( ■Hipoc.r vba) 
jacobacae (l, ), have been trisdj^ith unreliable results'. This 
was probably due oo tie variable weather conditions, at the .time '.of 
collection, the variety of food material, the lack cf uniformity ' in 
the size of the larvae, and the impossibility of knowing their age. 
Hyphantria cunea (Drury) the fall ^ebworm 
Mclndoo, Sievers, and Abbott ( 264 ) in 1919 reported that cat- 
erpillars about one— third grown w e re killed within a "*eek by a 
spray containing 1 pound of derris ponder to 5 gallons of ^ater. 
Mixtures ranging from 1 pound per 50 gallons to 1 pound per 200 
gallons 7'ere not satisfactory because nearly all the sprayed foliage 
was eaten and not all the caterpillars " - ere killed. 
Brittain ( 50 ) in 1924 reported derris to be of no value against 
the larvae. In chess tests the larvae were dipped in a suspension 
of derris in water and then allowed to feed on unsprayed leaves; 
also, larvae •'-ere allowed to feed on dipped leaves, 
Kopp (2_42^ in 1924 reviewed the use of derris as an insect- 
icide. Derris ponder has given excellent results against larvae ■ 
of this species. • . * 
Eelsali et al. (233) in 1926 reported that the larvae were 
strongly r'esisfca&b to derris dust and derris spray, Not even at 10 
pounds per 100 imperial gallons of "'ater did the derris have the 
slightest effect. 
Kelsall and Stultz ( 234 ) in 1937 reported laboratory tests of 
derris (3,95 percent rotenone) and pyrethrum (0.94 percent pyrethrins) 
as dusts, pith gypsum as the diluent, Derris 25 percent and 100 per- 
cent each produced 20 percent mortality in 5 days. Feeding on foliage 
was some-'hat reduced. Phrethrum at 50 percent gave 100 percent mort- 
ality in five days. 
