What Ails Your Plants? -By E. Porter Felt 



State Entomologist 

 New York 



A NEW KIND OF TABLE, DESIGNED TO HELP THE AMATEUR TO RECOGNIZE THE CAUSE OF THE 

 TROUBLE AFFECTING HIS PLANTS, SO THAT HE MAY APPLY THE PROPER REMEDY PROMPTLY 



[Editor's Note. — 'Most tables, ovspray calendars, assume an acquaintance with the insect or fungus causing the trouble or disease. In the present case the 

 remedy is arrived at by working from the known to the unknown. First of all the plant is given, then the gross apparent character of the trouble, the time of observa- 

 tion, and the general description of the cause; and from these the name of the insect or disease, as the case may be, is arrived at. The remaining columns tell of the 

 immediate remedies and general preventive measures. A synopsis of up-to-date remedies and their modes of preparation follow the tables.] 



Ornamental Shrubs and Vines 



Alder 



Burning bush, 

 Euonymus . . 



Lilac 



Rose 

 Rose 

 Rose 

 Rose 

 Rose 



Rose 



Viburnum or 



Snowball. . . . 

 Virginia 



creeper 



INJURY 



Woolly lice on stems. 

 Stems thickly scaled. 



Shoots wilting 



Buds eaten 



Leaves eaten 



Skeletonized leaves.. 



White specked or lousy 

 leaves 



White scale on canes. 

 Leaves mildewed. . . . 

 Curled, lousy leaves . 

 Leaves eaten 



Summer 



Growing season 

 Summer 



Spring and sum- 

 mer 



Spring 



Summer 



Summer 



Growing season 



Summer 



Spring 



Spring 



CAUSE 



Plant lice 



Dark bark louse 



White boring cater- 

 pillar 



Caterpillars 



Yellowish beetle. . 



Slimy caterpillars. 



Leaf hopper or 

 aphis 



White bark louse . . 



Fungus 



Plant louse 



Banded caterpillar 



Woolly alder aphis 

 Euonymus scale. . . 



Lilac borer 



Cutworms and cat- 

 erpillars 



Rose beetles 



Rose slug 



Rose-leaf hopper or 

 aphis 



Rose scale 



Rose mildew 



Viburnum aphis . . 

 8-spotted forester. . 



REMEDY OR 

 PREVENTIVE 



Kerosene emulsion 



Kerosene emulsion, 

 i to 4 parts water 



Cut out and destroy 



Poison 



Hand picking, net- 

 ting 



Poison or plaster. . 



Soap solution 



Cut out worst in 

 fested shoots 



Bordeaux 



Kerosene emulsion 



Poison or hand 

 picking 



REMARKS AND CAUTIONS 



Force spray through the protective 

 covering. 



Only partially successful, occurs 

 on lilac and bittersweet. 



Common, though not very des- 

 tructive. 



Hand picking is very effective. 



Poisons are of comparatively little 

 service. 



Use either when slugs are abun- 

 dant. 



Give repeated sprayings, especi- 

 ally early. 



Occurs on blackberry and rasp- 

 berry. 



Spray on appearance of disease 

 and 10 days later if necessary. 



Spray before foliage curls. 

 Occasionally a pest in cities. 



ArborvitK is 

 (see fruit trees). 



frequently badly injured by bag worm (see shade tree pests); Japanese quince is very subject to injury by scurfy bark louse and San Jose scale 



What Bothers the Small Fruits 



Currant (i) 



Currant 



Currant .... 



Currant 



Currant 



Grape 



Grape 



Grape 



Grape 



Grape 



Grape 



Grape 



Grape 



Raspberry and 



Blackberry . . 

 Raspberry and 



Blackberry . . 

 Raspberry and 



Blackberry . 

 Raspberry and 



Blackberry . 



Strawberry . . 

 Strawberry . . 

 Strawberry . . 



INJURY 



Leaves discolored 



Leaves irregularly brown 

 spotted 



Leaves stripped 



Wilting tips 



Leaves brown spotted 



Tips of shoots webbed 



Buds destroyed 



Clusters wormy 



Vines sickly, roots badly 

 scored 



Light specked leaves 



Dark spotted shoots 



Whitish growth on leaves. 



Dark spotted fruit 



Wilting tips 



Leaves riddled 



Stems gray, cracked 



Orange-colored spots on 

 leaves 



Newly set plants dying. 



Dead patches in bed 



Leaves blighted 



Spring and fall. 



Spring 



Spring and sum 

 mer 



June 



Spring and sum- 



mer 



Summer 



Early spring . . . 

 Summer and fall 



Summer 



Summer 



Summer 



Summer 



Summer 



Spring 



Spring 



Summer 

 Summer 



Spring 



Spring and sum 

 mer 



Spring and sum- 



Plant louse 



Reddish or yellow 

 and black bug . 



Spotted caterpillars 



White borers 



Fungus 



Whitish caterpillar 

 Green beetle 



Small caterpillars. . 



Brown beetle and 

 white grubs 



Whitish hoppers . . 



Fungus 



Fungus 



Fungus 



White maggot 



Greenish larva? . . 

 Plant disease 



Fungus 



Grub at roots 



Grub in crown 



Fungus 



Currant aphis 



4-lined plant bug. . 

 Currant worm.... 

 Currant stem borers 



Leaf blight 



Grape plume moth 

 Steely flea beetle . 

 Grape berry moth 

 Grape root worm. 



Leaf hopper 



Anthracnose 



Downy mildew 



Black rot 



Raspberry can 

 maggot 



Blackberry sawfiy 



Anthracnose 



Red rust 



White grub 



Crown borer 



Leaf blight 



REMEDY OR 

 PREVENTIVE 



Kerosene emulsion 



Kerosene emulsion 

 for young 



Poison or hellebore 



Burn infested tips . 



Ammoniacal cop- 

 per carbonate 



Crush caterpillars . 



Paint buds with 

 poison 



Spray with poison 

 in June 



Poison foliage in 

 June 



Spray with whale- 

 oil soap 



Copper sulph. sol'n 

 and Bordeaux 



Bordeaux 



Bordeaux. Ammo- 

 niacal cop. carb'te 



Poison ineffective . 



Poison or hellebore 



Copper sulph. sol'n 

 and Bordeaux 



Burn infested plants 



Dig out and destroy 



Destroy infested 

 plants 



Bordeaux 



REMARKS AND CAUTIONS 



Apply early before leaves curl. 



Burn egg-bearing currant tips. 



Use hellebore after fruit is half 



grown. 

 Cut well below affected part of 



cane. 



Bordeaux after fruit is picked. 



Apply poison if pest is abundant. 



Spray with poison 10 to 14 days 



later. 

 Keep surroundings clear of brush 



and weeds. 



Destroy pupas by cultivation. 



Collect with sticky shields or 

 other device. 



1st before buds open, 2nd 3 to 4 

 days later; burn diseased wood. 



Spray when leaves are fully ex- 

 panded. 



1st to fully expanded leaves; after fruit sets in i to 

 3 Tk. intervals till %. grown. Then 2d every 

 7 to 14 days. 



Cut and burn infested shoots. 



Apply to expanded leaves and 

 again 2 to 3 weeks later. 



Cut and burn badly infested 

 canes. 



Affection not amenable to treat- 

 ment. 



Avoid setting plants on infested 

 land. 



Put new fields in another location. 



Apply when growth begins, when 

 fruit sets, and after fruiting. 



(1) Currant is badly injured by San Jose" scale (see fruit trees). 



221 



