12 The: Colorado Experiment Station. 
many of the tiny, red mites could be found where they had died on 
the limbs very soon after hatching. In no case were any found alive, 
except a few immediately hatched from the eggs. In the un¬ 
sprayed orchard all the mites seemed to live and the trees were soon 
covered with them. Throughout the season the sprayed orchards 
were almost entirely free from mites,.while the unsprayed one, lo¬ 
cated between the other two, had quite a serious infestation. 
As a result of the extensive use of a lime and sulfur spray in 
the Palisade section the past season, the brown mite was practically 
exterminated, except in a few orchards where such a spray was not 
used. 
the red spider (Tetranychus bimaculatus) 
This mite differs from the preceding one in its wintering hab¬ 
its ; instead of living over in the egg stage, as the brown mite does, 
this species hibernates in the soil as an adult, close to trees upon 
which it has been feeding, or underneath rubbish of any kind. On 
the 7th of November, this season, they were found plentifully, under 
burlap bands that had been applied to trees for the purpose of trap¬ 
ping the codling moth larvae. Hibernation begins before the cold 
weather sets in; the first downward migration of mites to the soil 
was noticed at Grand Junction, this season, on July 26. While a 
few of them may work on trees until late in the fall, their damage 
is usually over by the 15th of August. 
Eggs are laid in the spring by mites that have lived through 
the winter. These eggs are pearly white, and may be seen as tiny 
specks on the under surface of the leaves. 
When first hatched from the egg this mite, like the species 
previously treated, has only six legs, the fourth pair developing with 
the first moult. They are somewhat smaller than the brown mite, 
usually green in color while feeding upon the foliage of trees, with 
minute black dots on the dorsum of the abdomen. When feeding 
ceases in the fall, and they begin their downward migrations to the 
soil, they become an orange, or red color. During my observations 
of this species of mite, for the past three years, a red one has never 
been seen on fruit trees until feeding ceases in late summer. In 
greenhouses this same species is very often red in color. Unlike the 
brown mite, the red spider has the power of spinning a web, and 
may easily be detected, when prevalent, by the presence of these 
webs on the foliage, or branches of infested trees. The appearance 
of injured peach foliage is not unlike the appearance of that injured 
by the brown mite, but is more inclined to turn yellow in patches. 
Control Measures .—Sulfur is very successful in treating this 
mite also, whether dusted upon or applied as a liquid spray to in¬ 
fested trees. When applied in water, by means of a spray, sulfur 
should be very finely screened, and mixed with the water by using 
