

PEST CONTROL 
Cech ates hate Genter 
TARNISHED PLANT BUG 
The tarnished plant bug or sting fly comes into the greenhouse through open doors and ventilators in 
late summer or early fall and does considerable harm to this crop. Chrysanthemums growing in the 
open are frequently affected, varieties such as Mary L. Hall and Sea Gull are attacked to a greater 
extent than other varieties. 
INJURY. It has sucking mouthparts and obtains its food by inserting its long, slender beak into the 
plant tissues and sucking up the contents of the injured cells, apparently injecting saliva, which 
causes the death of the tissue in the immediate vicinity. The stem is often slightly bent and the 
terminal growth is malformed because of this injection. 
CONTROL. There is very little that can be done to combat this pest. Fumigation, using either calcium 
cyanide or nicotine, should be effective. All weeds and undergrowth in the vicinity of a green- 
house should be removed. It has been reported that D, D. T. is an effective control. 
THRIPS 
The chrysanthemum is usually attacked by one or more species of thrips. These small, narrow-bodied, 
active insects, which range in color from yellow to brown or almost black, injure both the leaves and 
the blossoms. 
INJURY. Thrips have mouth parts that are fitted for piercing and scraping the leaf surface and for 
sucking the juices and other cell contents. The upper surface of the foliage is covered with whitish 
blotches while minute black specks appear on the lower surface. Unless a constant watch is kept 
on the plants, and control measures properly executed, thrips are capable of causing severe injury 
within a short time. 
CONTROL. Tarter emetic at the rate of 2 pounds, to 100 gallons of water plus 4 pounds of sugar 
sprayed on during the late afternoon or evening will give good control. SALP at the rate of | 
quart of SALP, 2 pounds of sugar to 50 gallons of water has proven to be very effective during 
the high temperatures during the summer. Constant fumigation with Nicofume or calcium cyanide 
will help control this insect. Loro 1-800 plus DuPont Spreader Sticker |-1200 will control thrip but 
will cause slight injury to some varieties. The latest insecticide that has proven its worth on the 
control of thrips is D, D. T. It is sure death to this insect, Deenate 50W used at the rate of 
one pound to 50 gallons of water has given good control. D. D. T. is available as a dust or spray; 
can be applied separately or combined with other spray materials. D. D. T. is more staple when 
stored in powder form, 

Tarnished Plant Bug Damage Thrip ensues 
