The fourth body segment is raised dor- 
sally to form an oval red hump from 
which the insect gets its common name. 
Remedies 
Arsenicals applied to the leaves are ef- 
ficient and probably the reason that we 
seldom hear of this pest doing serious 
damage is because they are poisoned by 
the sprays used for codling moth, etc. 
Red-Necked Apple Tree Caterpillar 
Datana ministra 
A moderately large black caterpillar, 
loosely clothed with soft hairs, and 
marked with parallel longitudinal yellow 
stripes. Disposed to be social, but makes 
no web. Adult a reddish brown moth. 
Sometimes attacks a tree or two in nur- 
sery or orchard, and then strips whole 
branches, or the greater part of whole 
trees, of leaves. The caterpillar when at 
rest elevates both head and hind end of 
the body and has a habit of gathering in 
large masses on the trunks of trees. 
The species passes the winter in the 
pupa stage in the soil under trees, and 
comes up as a moth in late spring to place 
its eggs on the leaves. 
Not noted in the Northwest. 
Burn with kerosene torches or spray 
with arsenate of lead. 
Red or Six-Spotted Spider or Mite 
*Tetranychus bimaculatus Harv. 
Tetranychus sexmaculatus Riley 
General Appearance 
This species (like the other mites) is 
exceedingly small and individuals are sel- 
dom noticed excepting when they collect 
in great numbers. The color is red with 
a yellowish tinge .and usually with two 
darker spots on each side of the body. 
The young greatly resemble the adults 
but have six rather than eight legs. 
Life History 
The mites usually begin to appear 
after the first warm weather in the spring, 
the winter having been spent in the 
ground. They spin threads so as to con- 
ceal themselves, their eggs and young, on 
*We are informed by Dr. H. E. Ewing that 
the correct name of this species is Tetranychus 
telurius inn. 
ENCYCLOPEDIA OF PRACTICAL HORTICULTURE 
the undersides of the leaves and feed di- 
rectly upon the tissues of the plant by 
sucking which gradually stunts and kills 
the latter. The common red mite is a 
serious greenhouse pest, where, under fa- 
vorable conditions, it is able to work 
throughout the entire year. 
Distribution 
Though of foreign origin this. mite 
has become thoroughly distributed over 
the entire state and is met alike in field 
and greenhouse. 
Food Plants 
This mite is an omnivorous feeder, ap- 
parently without any favorite food. The 
plants which it is known to attack are 
sugar beets, beans, sage, tomato, ege- 
plant, pepper, cucumber, squash, cowpea, 
Fig. 1. 
Mite Eggs About an Apple Bug. 
hops, berries, violet, rose, clematis, mig- 
nonette, pink, fuschia, pelargonium, go- 
detia, passiflora, feverfew, thunbergia, ver- 
bena, heliotrope, moon-flower, calla, smilax 
and easter lily. 
Control 
Sulphur and dehydrated lime mixed in 
equal proportions and thoroughly sprin- 
kled over the plants are recommended. 
Sprays such as emulsions, resin wash and 
soap solutions are efficient remedies, but 
these are usually too destructive to the 
tender leaves of the food plants to be prac- 
ticable. The flour paste spray is especially 
recommended in such cases. 
