Aldrin dust (in a 1.25% formulation) was thoroughly mixed into 
the top 6 inches of soil at the rate of 3.75 1b/A. Field plots were 
6 feet square in a randomized‘block design. All plots were kept fallow 
with herbicides, Sampling of the plots at intervals of 2 - 3 months 
revealed no significant effects on earthworms. 
Polivka (1953) reported two experiments using aldrin. In the 
first, the application rates were 1, 5, 10, 20, 40, and 80 1b/A. Treat- 
ments were made March 2, 1951, on an Ohio golf course, Earthworm 
populations were not reduced significantly by May 7, but on June 4 and 
September 27, populations on all plots treated with 5 1b/A or more were 
significantly lower than those on untreated plots. There was some doubt 
of the validity of these results, however, because of natural population 
changes during the period. In further experimentation, aldrin was used 
at rates of 1, 3, 6, and 12 1b/A on May 14, 1952. Soil moisture was high 
(1.42 inches of ran fell in the period of observation) and on June 2, no 
effects of the treatment, on the worm population were ascertained. 
Hopkins and Kirk (1957) conducted two laboratory tests of the 
effects of aldrin on red; worms, Eisenia foetida (sp.?). In the first 
experiment, 2.5% aldrin dust at the rate of 7.5 1b/A was mixed with 
South Carolina Marlboro sandy loam. No significant mortality had occurred 
after 2 months. In the second experiment, the worms were exposed to 
equivalents of 64, 128, and 256 1b/A of aldrin for 4 days. There was no 
mortality of adult worms at the lowest level, but 93% at the highest 
level. An LD5p9 at 96 hours was computed to be 170.3 1b/A of aldrin. 
In order to control damage to tobacco seedlings caused by 
earthworms in India, Patel (1960) recommended aldrin emulsion spray at 
a rate of about 136 1b/A [0.05% emulsion spray; 1 oz aldrex 40, 
emulsifiable concentrate, in 5 gal (Imperial) water]. One gallon of 
formulation was used per 16 square feet, more if the soil was dry. 
Schread (1952) reported control of Oriental earthworms 
(Pheretima hupeiensis) on golf greens several weeks after application 
of aldrin either as a water emulsion or as wettable powder (mixed with 
fertilizer and soaked in) at the rate of 33 1b/A. 
Aramite 
Hyche (1956) experimented with several insecticides at 
different concentrations in an effort to kill mites (Caloglyphus 
anomalus) in beds of earthworms [Eisenia foetida (sp.?)] but not 
harm the worms. He used aramite at about 9 - 11 1b/A ( 2 1b of 
15% wettable powder per 100 gal water; 1 gal per 12 - 15 sq ft of 
bed) and found that both the worms and the mites survived. The lethal 
rate for the worms was not given. 
