-116- 
duet was tested Airing four seasons, but it was found unsatisfactory 
against the tobacco thrips on shade-grown tobacco.— Morrill and 
Lacroix (427-429 ); Morrill (426). 
Frankliniella vaccinii Morg., a blueberry thrips 
Cube dust, derris dust, and nicotine-lime dust had no apparent 
effect, — Lathrop (358). 
Frankliniella willlamsl Hood 
In the Philippine Islands this thrips can be controlled on maize 
by spraying with soap solution and nicotine sulfate or derris powder. 
— Otanes and Karganilla (453 ). 
Heliothrips haemorrhoidalis (BoucAe), the greenhouse thrips 
Sprays containing rotenone were relatively ineffective.-- Bartlett 
and Per sing (36). 
Derris was less effective than nicotine.— Biglish and Turnipseed 
(168) . 
Isoneurothrips parvispinus Karny, a tobacoo thrips 
In Java a satisfactory spray was prepared by adding two parts by 
volume of neutral coconut oil or ground-nut oil to eight parts of a 
benzene extract of powdered derris containing 10 to 12 percent of rote- 
none. This was diluted for use and gave 98 to 100 percent mortality of 
the thrips on tobacco.— Thung ( 592 , p. 43) • 
Rhopalothrips bicolor Hood, a prickly pear cactus thrips 
A 5-percent rotenone powder, used at the rate of 2 pounds per 100 
gallons of weter with a spreader, gave a very good kill.— Bailey (29). 
Taeniothrips simplex ( Mori s on) , the gladiolus thrips 
Derris powder in combination with peanut oil and sodium oleyl 
sulfate gave poor control.— Johnson and Smith ( 328) . 
Sprays containing derris and peanut oil were ineffective and 
injured the plants.— U. S. Bureau of Entomology and Plant Quarantine 
(616, p. 64). 
