-78- 
i- .. 
t 
5-nrpy material • ^- plications | 7'- rmy f ruit 
Number Percent 
Cube root 2 lb. , soybean flour 1 lb. 
in 100 gal. of ^ater 3 1.38 
Do. 4 1.13 
Phenothiazine 2 lb. in 100 gal. of rater 2 4.56 
Do. 4 .31 
Light arsenicals fbllo^ing the grower' s 
shuck spray 2 3.21 
Hamilton ( 133 ) in 1940 reported that in field tests both cube root 
and phenothiazine reduced heavy populations of fruitflies ( Rhagoletis 
cingula ta and R. fauste ) satisfactorily vhen at least three .applications 
vere made at the rate of 2 pounds per 100 gallons of spray. In one test 
a 15-percent-phenothiazine dust appeared to be nearly as effective as 
these sprays. Basic zinc arsenate only partially controlled cne~ry fruit- 
flies when t'-'o light applications ~ r ere made. Cube containing 4.4, 4.7, 
or 5.3 percent of rotenone was used at the rate of 2 or 2-1/2 pounds per 
100 gallons. Soybean flour (l/2 lb.) or r commercial" spreader ( 1 pt.) 
was used in most tests, also flotation sulfur paste (6 lb.) as a fungicide. 
Rhagoletis feusta 0. S. , the black cherry fruitfly 
See Hamilton and Pearce ( 134 ) and Hamilton ( 133 ) under Rhagoletis 
cingulata, on pp.77and 78, respectively. 
•^hagoletis pomonella (Welsh), the apple maggot; the .blueberry maggot 
The Maine Agricultural Experiment Station (195) in 1935 reported that 
a pyrethrum-derris insecticide was tested for control of the apple fruitfly 
being applied at the rate of 1:400 in the fourth cover spray. It is not 
feasible to dra^ conclusions fron this preliminary test. Experiments '-ith 
pyre thrum and derris rr ill be continued. 
Garman (91, 9_2) in 1936 reported that his first field experiment 
v, ith derris was conducted that year and ^eve unfavorable results, but 
more ^ork was needed to establish whether derris has enough action in 
the field to be considered. In 1936 he reported that in labor- tory tests 
derris showed considerable toxicity to anple m-ggot flies: in field tests 
it was much inferior to either cryolite or lead arsenate but trees sprayed 
ir ith it showed considerable improvement over unsprayed trees. A summary 
of laboratory control experiments to kill adult flies of the ap^le maggot 
is given in the following table: 
