612 
BEET DISEASES 
Beet Scab 
Thought to be the same organism as 
produces the potato scab and affects the 
roots in much the same way. 
Rotation of crops is suggested. 
See Scab under Potato. 
Crown Rot 
Phoma Betae 
Distributed pretty generally through- 
out the beet growing sections. 
Curty Top. See Beet Leaf Hopper, this 
section. 
Downy Mildew 
Peronospora schachti 
Causes a stunting of the inner leaves. 
Occurs during the rainy season. 
Destroy all affected plants 
Leaf Spot 
Cercospora beticola Sacc. 
Produces small dead spots in the leaves 
followed at times by dying of the leaves. 
Bordeaux mixture applied at intervals 
of three weeks. 
Root Knot 
Caused by the Nematode gall worm. 
See under Potato. 
Root Rot 
Rhizoctonia sp. 
Appears in the young plant as a decay 
of the root. Causes the root to fork and 
become misshapen. 
Crop rotation, or, where practicable, soil 
disinfection seem the best remedies. 
Rust 
Uromyces betae 
Appears as a red rust on beet leaves 
when grown in the rainy season. Not 
serious. 
BEET PESTS 
Beet ApHis, Beer Roor ApHis, CaLt- 
FORNIA Breer Root Apuis. See Aphids. 
See also Beet Louse, this section. 
The Beet Army Worm 
Laphygma exigua Hubn. 
Family Noctuidae 
Caradrina exigua Hubn. 
General Appearance 
The adult moth is mottled gray with 
distinct light markings on the fore wings. 
It is about one inch in length, with a 
wing expanse of one and one-half inches. 
ENCYCLOPEDIA OF PRACTICAL HORTICULTURE 
The larvae are slender, dark green in 
color and distinctly striped 
Life History 
The adult moths appear during the 
months of April and June and deposit 
eggs, the caterpillars hatching out in May 
and the last of June and becoming most 
abundant in August. There are probably 
three generations a year—the first and 
last doing the least amount of damage 
Food Plants 
The favorite food of the caterpillars is 
the sugar beet and it bids fair to become 
quite a serious pest to that crop Table 
beets, corn, potatoes, peas, onions, sun- 
flower, lambsquarters, pigweed, saltbush 
and the leaves of the apple, mallow, wild 
tobacco, plantain and wild grasses are 
also attacked. 
* Poison mash as for other cut worms. 
E. O. Essie 
Beet Leaf Hopper 
Hutettic tenella Baker 
The adult is a small, pale yellowish- 
green species. When fresh or when flying 
this leaf hopper appears almost white, and 
for this reason it has often been called 
the “white fly.” 
The eggs are white, elongate, slightly 
curved and tapering at one end, and are 
thrust into the leaf stem. 
The nymphs are very active, pale 
creamy white or variously colored forms. 
The commonest form is pale creamy in 
color with a brown saddle on the middle 
of the abdomen. 
The distribution seems to be general 
over the West. 
The condition called ‘“curly-leaf” or 
“blight” accompanies the attack of these 
insects and its severity is in proportion 
to their numbers. 
Remedy 
Spray with kerosene emulsion stock 
solution one to five parts water, using a 
drag to turn the beet leaves up. 
Bureau Entomology Bulletin 66 
Beet Louse 
Pemphigus betae Doane 
General Appearance 
The adult wingless lice are about one- 
eighth of an inch long; somewhat round- 
