-41- 
in a cage placed over a plot treated with 1 gallon of Gesapon No. 18 di- 
luted 1 to 400 with Twater. The emergence in the control cage was 14 
thrips.— Jones (231) . 
In Oregon one application of Gesarol A-20, 1 or 2 pounds plus 2 
pounds of whale oil soap per 100 gallons of spray j also Gesarol SH-5 at 
the rate of 1 or 2 quarts per 100 gallons of spray; and also dusts con- 
taining 2 or 3 percent of DDT applied at the rate of 35 pounds per acre 
caused heavy mortality of adult thrips on prune trees. Gesapon 18 (5- 
percent DDT in oil) at the rate of from 1 to 4 quarts per 100 gallons 
of spray applied to the soil permitted 2 adults to emerge as compared to 
over 1000 from adjacent untreated plots •--Jones (232 ) . 
Taeniothrips simplex (Morison), the gladiolus thrips 
Sprays containing 20 percent of DDT in pyrophyllite, with and with- 
out sugar, at the rate of 1 pound of DDT per 100 gallons, and a 3-percent 
DDT dust were applied to blooms of gladiolus. The spray treatments gave 
as good oommeroial control of thrips as reoommended tartar emetic treat- 
ments. The dust was superior to the sprays in reduoing injury to blooms 
when applied every second or third day.— N. J. Agr. Expt. Sta. (275 ) . 
Thrips nigropilosus Uzel, the chrysanthemum thrips 
In greenhouse tests excellent control of ohrysantnemum thrips was 
secured with 2 ounces of DDT in either powder suspension, aoetone suspen- 
sion, or Velsicol emulsion per 100 imperial gallons of water. Complete 
control was secured in a small-soale test with two applications of DDT, 
4 ounces in Velsicol emulsion, and in a large-scale test with one appli- 
cation at 16 ounces. Observations showed that the eggs were not killed 
but newly hatching larvae were. Four ounces of DDT in acetone suspen- 
sion gave excellent control of a fairly heavy infestation.— Ross (306 ) • 
Thrips tabaci Lind., the onion thrips 
In small-plot tests for oontrol of onion thrips on onions, the 
population was significantly reduced 24 hours after treatment with 2.5*, 
5- and 10-percent DDT dusts applied at dosages ranging from 0.21 to 1.70 
pounds of DDT per acre. Although the population decreased with the in- 
crease in quantity of DDT applied, there was no significant difference 
in the reduction obtained -when 0.50 pound or more per acre was used. In 
small-plot tests conducted in 1943 one application of a 3-percent DDT 
dust gave very good kill of a heavy infestation of Thrips tabaci and 
Frankliniella fusca (Hinds) on cotton.— Loft in (247 ) . 
Small cotton plants lightly infested with onion thrips were treat- 
ed with a 3-peroent DDT dust (A-3) at the rate of 25 to 30 pounds per 
acre. After 24 hours no thrips oould be found on these plants.— Smith 
(324). 
