-17- 
solution in the same way and developed the same symptoms, which 
took the form of a hyperesthesia increasing in intensity until 
any sudden noise or movement was sufficient to induoe general- 
ised clonic spasms, which became continuous in the later stages 
and led to the death of the rats*** 
The author ate two or three "bunches of sound grapes and peeled peaches 
that had been sprayed with IDT, with no bad effects in either case*— 
Brcoley (96) . 
EFFECT OF DDT ON PLANTS 
Tomatoes, potatoes, cabbage, turnips* onions, beans, peas, and to- 
baoco are tolerant to low strengths and reasonable dosages of DDT dusts, 
but some injury to squash or other cucurbits may be expected*-- ^Riite (573) » 
A 10-percent solution of DDT in cyclohexanone and light petroleum 
oil was sprayed in two areas at the rates of 6 and 4 pounds per acre. 
Neither 4osage caused any apparent injury on coniferous trees, but the 
foliage of deciduous trees showed injury which varied according to the 
speoies, as noted: 
Species E3M^£2^JS^EI. 
Speckled alder, Alnus incana Medium marginal, some spotting 
Aspen, jPopulus tremuloides Medium spotting 
Gray birch, Be tula populifolia Slight spotting 
White birch, Betula papyrifera do® 
Yellow birch, Betula lutea do 
Black cherry, 'Prun uT ^sTrotina Light marginal 
Chokecherry, Prunus virginiang Severe marginal 
Pin cherry, P runus peimsyl vaaloa Light to medium marginal 
Hazel, Corylus spo Slight spotting 
Mountain maple, Acer spicatum Medium marginal 
Red maple, Acer rubrum ~ Medium marginal and spotting 
Nannyberry, 'vffiurrann 'lent a go Light to medium marginal 
Serviceberry, Amelanc hi er canadensis do» 
Willow, Salix sp* d©« 
Bracken, raspberry, blueberry, strawberry, and wild honeysuckle suffered 
light to medium foliage injury.— Ross (306 ) #> 
Most of the trees and plants on which DDT was used have not shown 
evidence of injury* On some apple trees, however, there was some yellow- 
ing and dropping of foliage, but an increase in mite abundance was large- 
ly, if not wholly, responsible* In experiments with soil treatments for 
Japanese beetle grubs, 25 pounds of DDT per acre definitely retarded the 
growth of bush beans, lima beans, soybeans, hollyhock, onions, spinach, 
and tomatoes* Some of the bean leaves became yellow, and tomato plants 
