PEST and DISEASE CONTROL CHART ~ 
t' INSECT 
Red spider 
Any, 
inside or 
outside 
Gladiolus 
bulbs 
Thrips 
Any 
CONTROL MEASURE 
Parathion bomb, spray, or 
dust. 
REMARKS 
Parathion in the presence 
of sulfur causes leafdrop 
on roses. Parathion bombs 
not recommended on chry- 
santhemum flowers. 
TEPP bomb or spray. Di- 
thion bomb or smoke gen- 
erator. 
Ovotran (K-6451) bomb or 
spray. 
Sodium selenate on toler- 
ant crops. 
The 50% wettable powder 
-can be painted on steam 
pipes using 1 lb. per 100,- 
000 cu. ft. Vents should 
be closed 6-8 hours, tem- 
perature range 60°-85° F. 
Carnations, mums, asters, 
snapdragons, cyclamen, 
and St. Paulia. 
Aramite spray. 
Use 114 Ibs. of the 15% 
wettable powder per 100 
gal. plus a spreader and 
thoroughly cover the plant. 
Non-poisonous to humans, 
and has a long residual 
action on the plant. 
Dimite spray. 
Use at 1-1200 or 1-1600; 
stronger dilutions usually 
cause injury. 
Rotenone sprays. 
Less effective than any of 
the above and the oil in 
which it is dissolved may 
cause damage to some 
plants. 
Parathion, BHC, DDT. 
5% DDT dust. 
Corrosive sublimate, Lysol, 
formaldehyde. 
Parathion and DDT injure 
Kalanchoe and some other 
succulents. 
Bulb disinfectants. 
Parathion bomb, spray, or 
dust. ‘ 
Dithion bomb or 
generator. 
TEPP bomb or spray. 
BHC spray or dust. 
Nicotine and soap spray or 
nicotine fumigation. 
Rotenone spray or dust. 
smoke 
Leaf roller 
B® Mum midge 
White fly 
Leafhopper 
Ants 
B Scale 
Tarnished 
| plant bug 
Mealybugs 
DDT or Parathion. 
® Grasshoppers Any 
Parathion bomb or spray. 
TEPP or Dimite sprays. 
Chlordane for ants. Di- 
thion bomb or smoke, gen- 
erator for soft brown scale. 
Repeated applications nec- 
recommended 
after they 
essary. Not 
on. poinsettias 
show color. 
Use Santomerse S$ 1-2000 
as a spreader for better 
effectiveness. 
Chlordane dust or spray. 
Slugs Any 
Snails 
Cutworms 
-Sowbugs 
Leafminer 
and Foliar 
nematode 
- 
Chrysanthemum 
Rose midge 
and 
Strawberry 
root worm 
Begonia 
Cyclamen 
English Ivy 
Saintpaulia 
Snapdragon 
Snarol. 
Parathion spray. 
Sodium selenate. 
Nicotine 1-200 & soap. 
DDT. Three sprays of wet- 
table powder on plants, 
soil, and walks 10 days 
apart. 
Parathion bomb. 
Parathion spray. 
TEPP or Dimite sprays. 
Rotenone & nicotine spray. 
Compiled by 
DDT dust for sowbugs. 
Repeated applications nec- 
essary. 
DISEASE 
Damping-off 
Black spot 
Mildew 
CONTROL MEASURE 
REMARKS 
Arasan. 
Treat seeds — light cover- 
ing only. 
Fermate, Zerlate, or Par- 
zate. 
Steam sterilize soil mix- 
ture and pots. 
Destroy diseased seedlings 
or cuttings and: dust light- 
ly to prevent spread. 
Avoid injury to stems of 
seedlings or cuttings when 
potting or planting. 
llb. Fermate per 100 gal. 
with Santomerse S 1-2000. 
Chrysanthemum 
English Ivy 
Calendula 
Chrysanthemum 
Hydrangea 
Rose 
Saintpaulia 
1 Ib. Fermate, Zerlate, or 
Parzate per 100 gal. with 
Santomerse S 1-2000. 
Avoid splashing water on 
foliage. Regular spraying 
necessary. 
Avoid splashing water on 
foliage. 
6-8 oz. Iscothan per 100 
gal. with Santomerse S$ 1- 
2000. 
Wettable sulfur sprays 
with Santomerse S$ 1-2000. 
Sulfur dust. 
May cause yellow spotting 
on some rose varieties. 
Often bleaches flowers. 
Parathion and sulfur to- 
gether cause leafdrop on 
roses. 
Greenol, Fungtrogen, 
Grape and Rose dust, 
Malachite green. 
Root rot 
and 
Soft rot 
2 oz. wettable Spergon in 
1 gal. water. Soak 3 
hours. 
Cut off all rotted portions 
of bulb before soaking. 
Steam sterilize soil and 
pots. Plant bulbs imme- 
diately after soaking treat- 
ment. 
Leafspots 
and 
foliage 
blights 
(bacterial 
and fungus) 
Aster 
Azalea 
Begonia 
Carnation 
Chrysanthemum 
Cyclamen 
English Ivy 
Gardenia 
Geranium 
Hydrangea 
Botrytis 
blight 
Usually burns the foliage. 
Pinch and destroy heavily 
infested shoots. 
Only effective when pests 
are feeding on the foliage. 
When the pest is in the 
soil for part of its life 
cycle, bomb is not effec- 
tive. 
Repeated applications nec- 
essary. Usually injures cy- 
clamen severely. 
Repeated applications nec- 
essary. Avoid undue wet- 
ting of soil with TEPP. 
Repeated applications nec- 
essary—as often as every 
5-7 days. 
OHIO FLORISTS ASSOCIATION 
Root 
nematode 
Lily 
Carnation 
Chrysanthemum 
Snapdragon 
Aster 
Carnation 
Chrysanthemum 
Snapdragon 
Any 
1 Ib. New Improved Cer- 
esan per 50 gal. water. 
Soak 1 hour. 
Formaldehyde 1-50. 
1 hour. 
Soak 
Fermate, Zerlate, or Par- 
zate sprays or dusts. Avoid 
splashing water on foli- 
age. Give plenty of space 
and air. 
Discard badly infected 
plants. On English ivy it 
is reported that a soil re- 
action near pH 5.0 reduces 
leafspot. 
or Par- 
Santo- 
Avoid 
foli- 
Fermate, Zerlate, 
zate spray. with 
merse S_ 1-2000. 
splashing water on 
age. 
Appears as black or brown 
areas, half moon-shaped 
near tip of leaf. May also 
be due to insufficient fer- 
tilization with nitrogen or 
too acid a soil. 
High humidity favors its 
development. Use some 
heat and ventilation even 
in mild weather. 
Fungicide sprays spot the 
petals—flowers unsalable. 
Called petal blight and is 
quite common on white or 
soft varieties of carnations 
and chrysanthemus. 
Fermate, Zerlate, or Par- 
zate sprays with Santo- 
merse S 1-2000. Wettable 
sulfur with Santomerse 
S$ 1-2000. Sulfur dust. 
Steam sterilize soil, pots, 
and bench area where in- 
fected potted plants were 
grown. 
Dow MC-2. 
Chlorosis 
Chrysanthemum 
Discard stock, including 
diseased and ‘‘apparently 
healthy’’ plants. Buy stunt- 
free plants. 
Azalea 
Gardenia 
Hydrangea 
Re-establish root action by 
carrying on the dry side 
and apply iron sulfate at 
1 oz. per 2 gal. 
Acid peat desirable in soil 
mixture. 
Avoid splashing water on 
foliage. 
On ground beds without a 
bottom, complete control 
will be impossible to at- 
tain. 
Follow directions of manu- 
facturer. 
A virus which is slow to 
show symptoms. Appar- 
ently healthy plants may 
have stunt in them. 
May be caused by high 
pH, overwatering, 
nematodes, symphylids. 
root 
Chrysanthemum 
Snapdragon 
Mosaic 
Often caused by high ni- 
trates. Leach or apply a 
mulch of chopped straw or 
ground corncobs. 
If due to high soluble 
salts, leach thoroughly. 
Soil testing is useful in 
preventing this. 
Destroy badly infected 
plants. 
A virus disease which 
causes yellowish streaks 
or blotches to appear on 
foliage. Often spread by 
aphids or  leafhoppers. 
Keep them under control. 
