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TRITICUM sp. Wheat. 
There are many references on wheat flour as an insecticide, but 
instead of being poisonous it acts mechanically. Only three references 
will be cited here* 
Flour was found to kill the red spider. It glued the mites fast 
to the foliage, thus causing death mechanically rather than by poison- 
ing them.— McGregor and McDonough (253, p. 65). 
Wheat flour was ineffective against cockroaches.— Scott and co- 
workers ( 361 , p. 14). 
It was of no value against chicken lice.— Abbott (37, p. 7). 
VETIVERIA ZIZANIOIDES (L.) Nash. Synonym: Andropogon zizanioides Urb. 
Cuscus grass. Vetiver. 
An ointment prepared with the oil was employed in removing pedic- 
uli from the hair. — Drury ( 122 , p. 39). 
In the Gold Coast, Africa, the dried roots of this grass, when 
placed among clothes, prevented insect attack* — Irving ( 215 ) . 
This species was used in Haiti against bedbugs, plant lice, etc. 
The roots were placed in clothing wardrobes to keep away the insects.— 
Roark (332 , p. 39). 
This grass is cultivated in Brazil, and its roots were used as an 
insecticide.— Barcellos Fagundes (51). 
ZEA MAYS L. Indian corn. Maize. 
, The following are a few of the references pertaining to corn meal, 
oil of corn (maize) , and hordenine. 
Corn meal, dusted on cabbage plants in the morning while the dew 
was on, caused the imported cabbage worm to drop off and thus orotected 
the plants till it was washed off by the rain.— Chittenden (93, p. 8). 
Corn meal was ineffective against cockroaches and the dog flea.— 
Scott and coworkers (361 ) • 
The effect of oil emulsions on the foliage of young peach and 
apple trees was studied. The oils of corn and peanut were the least 
injurious of the vegetable oils tested.— Ginsburg ( 159 ) . 
