-61- 
Parlatoria proteus Curt* 
Same as for Chrysomphalus dictyoaperni (Morg.) •— Cory (119) ♦ 
Pseudocooous citri (Risso), the citrus mealybug 
In one small-scale test in a greenhouse there was no appreciable 
kill from one application of a spray containing 24 ounces of DDT in 
powder form per 100 imperial gallons of -water.— Ross (506) . 
Pseudococcu8 comstocki (Kuw.), the Corns to ok mealybug 
In laboratory and orohard tests DDT at the rate of 1.5 pounds per 
100 gallons has been found promising for control of this mealybug. Lab- 
oratory tests indioate that the spray affects the young mealybugs but 
not the mature females. The spray deposit is ooasiderably more toxio 
after a few hours than after 12 to 13 days.— Hough (217) . 
Results obtained with DDT on the newly hatched crawlers were promis- 
ing enough to warrant further tests.— Baker and Porter (81). 
Pseudooocous maritirous (Ehrh.), the grape mealybug 
Results with DDT on plants were unsatisfactory. Three weeks after 
spraying 70 percent of the plants showed infestation by Pseudoooocus 
maritirous , whereas plots sprayed with Loro were only 11 peroent infested. 
The DDT formula consisted of 10 pounds of 10 percent DDT in pyrophyllite 
(1 pound of DDT) in 100 gallons, with 3 fluid ounces of Du Pont spreader- 
sticker added. Applications were made with a power sprayer, 500- to 600- 
pounds pressure, with two large disc noazles.— Houser and Neiswander (219 ) 
Pseudoparlatoria perlatorioides (Comst.) 
Sai8setia hemisphaerica (Targ.), the hemispherical scale 
Same as for Chrysomphalus dlctyospermi (Morg.) .—Cory (119 ) • 
Saissetia oleae (Bern.), the black scale 
Two field tests were made against this pest on olives. An oil-DDT 
spray (2 gallons of a light medium soluble oil containing 5 peroent of 
DDT per 100 gallons of water) and an oil-derris spray (0.5 pound of derris 
containing 5 peroent of rotenone per gallon of heavy medium oil) gave 
about equal control of adult females, but apparently the crawlers were 
more efficiently controlled with DDT than with derris. Before recom- 
mendations are made for the use of DDT, further evidenoe of control should 
be obtained.— Stafford (327). 
