FOOD PLANTS. 
29 
was green and fresh as it should be. The fields examined have a whitish- 
yellow cast to the usual green appearance. August 30 several fields were 
visited and every leaf in the fields examined was attacked by the thrips. The 
alfalfa has a whitish and bleached appearance, due to the effects of the thrips' 
feeding. I never saw anything to equal this in appearance or in thoroughness 
Fig. 9. — Alfalfa showing injury by the bean thrips. (Original.) 
of attack. September 30 the fields were still being badly damaged. After a 
field is newly irrigated just after cutting for a week or 10 days the damage is 
not noticeable, but after three weeks nearly all leaves show the effects and the 
alfalfa presents a very sickly appearance. A lack of sufficient water causes 
the damage to be more noticeable, as under such a condition the growth of the 
alfalfa is not so rapid and the thrips' damage is more conspicuous. 
