How to 
Identify 
Control 
How to 
Identify 
Control 
How to 
Identify 
Control 
Eyal 
WEST CHICAGO 
RED SPIDER 
Actual size: ¢& inch 
Not usually red—more often are 
yellowish or orange. Very small. 
Usually found on under surface of 
leaf. First sign of injury is pale 
green mottling of upper leaf sur- 
face. Will eventually cover lower 
surface with fine spider webs— 
later will spin webs over stems, 
buds, even support stakes. Build- 
up very rapidly in hot, dry summer 
greenhouse. 
Preventive program, page 5. Para- 
thion very effective. Outdoor grow- 
ers report good control with Systox, 
1 liquid oz. per 100 sq. ft. of area. 
APHIS 
Actual size: 7 inch 
Soft bellied lice. Pale green to dark 
brown, or nearly black. They usu- 
ally infest new growth tips, leave 
molted skins, cause tips to be de- 
formed. Also will infest open 
flowers. 
Preventive program, page 5. Lin- 
danes especially effective. 
LEAF TIER 
Actual size: Y2 inch 
This is the fellow that ties a Mum 
leaf about himself with a fine web 
—ruins foliage effect. 
Preventive program, page 5. DDT 
is very effective. 
ele COMMON 
OFFENDERS 
MIDGE 
Actual size of gall: 7g inch; adult 
fly, 1/14 inch. 
What you usually see are the pe- 
culiar small (a6 inch) light col- 
ored humps or warts—usually on 
the new, tender leaves. Inside may 
be found the tiny egg or larvae pic- 
tured above—or he may be gone! 
Eventually cause gnarling and de- 
forming of entire growth tip. 
Preventive program, page 5. DDT 
dust kept on all foliage is very ef- 
fective. 
THRIP 
Actual size: 35 inch 
Usually pale green, sometimes 
darker brown. Infest foliage and 
open flowers; cause general brown- 
ing of blooms, especially in warm 
weather. Flowers must be picked 
apart and examined carefully with 
hand lens to find them. 
Preventive program, page 5. DDT 
especially effective. 
LEAF MINER 
Actual size: 3/16-%4 inch 
You first know about leaf miners 
by the unusual appearing ‘‘tun- 
nels’’ they dig across leaves—leav- 
ing both upper and lower leaf sur- 
faces intact. 
Preventive program, page 5. Hand 
picking helps, but is slow work. 
SYMPHILIDS 
Actual size: V3 inch 
Found in soil, usually around roots. 
If Mums seem checked, growing 
slowly, yellow leaf edges; dig a. 
few of the poorer plants. If you 
see these little white fellows run- 
ning for cover, you’ve got sym- 
philids! They chew at root tips. 
On raised benches: steam. On the 
ground, drench soil with Lindane. 
Use 12 ounces of 25% wettable 
powder dissolved in 200 gallons of 
water per 1000 sq. ft. 
MEALY BUGS 
Actual size: 3 inch 
They’re pure white, have a sort of 
waxy coating over them, usually 
are found in clusters. Often they 
hide themselves under leaves, etc. 
They are soft-bodied. 
Preventive program, page 5. 
TARNISHED PLANT BUG 
Actual size: Y4 inch 
An easy-to-identify beetle. Their 
sting harms tissue of plant, often 
causes deforming of growth, bend- 
ing of tip. 
Preventive program, page 5. Para- 
thion is effective. 
