- 29 - 
DDT is much mors persistent. BHC and chlordane become ineffective after 
1 to 2 months, "but the toxic effect of DDT is appreciable after 10 months, 
None of the three was very effective upon enameled surfaces. BHC caused 
a quick knockdown hut if insects were then removed from treated surfaces, 
final mortality was often very low. Recovery after knockdown from DDT 
or chlordane v/as rare.-- Petty (.225.) * 
Rhino ter mi tid&e 
Reticu lltermes flavloes (Kollar), the eastern subterranean termite 
Chlordane mixed with sandy soil, 1 to 20,000, remained toxic for 3 
years. — Hetrick ( 2 16) . 
Unidentified termites 
Soil treated with a 0. 25-percent emulsion of chlordane remained 
toxic to termites 13 months after application in a test at Urbana, 
Illinois.— Shelf ord (j&Z). 
A second test, made one year after the first test, showed that the 
soil had lost no toxicity. Furthermore, there was no difference between 
samples from a 3 inch and an 8 inch depth. — Shelf ord ( #L , 8 ) . 
THYSANOPTERA 
Thripidae 
Pranklinie3,la fusca, (Hinds), the tobacco thrips 
In small plot tests at Baton Rouge and Bossier City, Louisiana in 
19^8, three applications of 10-percent chlordane dust at the rate of 10 
pounds per acre at weekly intervals, beginning with the appearance of the 
first true leaf, gave satisfactory control. Although this treatment re- 
sulted in significant increases during the seedling stage in height and 
leaf surface of the treated plants as compared to the untreated checks, 
the differences were not reflected in yield between treated and untreated 
plants. — Newsom £t aJL» (.248) . 
Heliothrips haemor rho idal i s (Bouche), the greenhouse thrips 
In laboratory tests with adult female thrips chlordane was less toxic 
than DDT, gamma-BHC, TEPP, and parathion; about as toxic as toxaphenej and 
more toxic than TDE and methoxychlor. A concentration of 0.0035 percent 
gave a fifty percent kill.— Metcalf (322). Metcalf et al. (325). 
Scir t othrips citri (Moult.), the citrus thrips 
Chlordane was not promising in tests in southern California. — Ewart 
(i3Jt). 
