Payette enterprise. (Payette, Canyon Co., Idaho) 1909-1935, 1914-01-29
EXCELLENT PAPER ON
FIRE BLIGHT
CONTINUED from page q


season in order to have the blight.
The second is insects, the hone.
Doc is one of the most active in car
rying the blight to blossoms, othe
insects visit the pear and apple bios
sons. not only must the insect b,
present and the germs there to b,
carried but the weather conditions
must be favorable for insect activit,
as well as bringing the tree int
condition for Infection.
Flower visiting insects usually Ike
sunshiny days especially following Z
moist season.
Water sprouts and spurs often de
termine infection.
Factors Governing Spread Of lnfectio,
The vigor of the tree has much t.
do with the damage, received aftea
infection has been introduced, the
more vigorous and thrifty the tree
the more serious the damage, the Wig
or itself being the effects of fertiliza
ton, cultivation, moisture, and the
presence of other diseases.
"Alkan" soils seems to favor the
blight. the age of tree exerts an
influence, the older and slower grow
Ing the pear tree or apple the less
1t Is attacked.
The style of pruning exerts some
influence, not only on the behaviour
of the blight but on convenience OF
the orchardist in eradication OF the
disease.
The most desirable form OF tree
Is the broad vase shaped tree clean,
free from water sprouts at the base,
having no spurs or small branches
near the trunk and having lateral
twigs for fruit bearing at as greaf
distance as possible from the crown
of the tree
Remember weather exerts a great
influence on the blight, certain spell 8
OF weather can be noted as blight in
lection weather, many suppose that
the long hot days of summer on the
Pacific Coast States gives poor OPP
portunity for the blight, but that is
rot the case. if there Is proper cult
alton and dust mulch produced to
prevent evaporation, you will find
the blight progressing.
When trees are growing their best,
especially Pears, the blight germ
feeds on the rich sugars, and rich
food materials in the sap, SO that
conditions which favor the growth,
favor the germs for remember the
& srm itself is only plant dependent
L pom rich food for its growth.
Cloudy rainy weather therefore
v bile favoring Infection often re-
salts in starved condition of the
tr ses, not favorable to blight.
Psychologists know that in order fol
green plants to form starch in its
foliage, requires the action OF sum
light. the more intense the sunlight
tie more rapidly the formation of
starch goes ON, in cloudy weather
very little starch is found In the leav-
-. pear trees do not make use OF
starch but through action of certain |
y mes this starch is changed to sug-
II and translocated to all parts CT
he tree by the sap.
1t Is in the sap that the blight
'erm works and thrives, the regular
,rowth Of the trees In the west tends
o keep the blight germ at work,
While IN the east where the growth
accompanied by a day or two OF
Loudly weather viii cause the trees
O close up their terminal buds
Control.
In the control of any plant disease,
specially Of one in the nature Of anI
pidemic or infectious the facto.s
'hich enter the problem are ~
.nowledge OF effects. (2) Adequate
orticultural inspection and quaran-
ne measures CO. Education. az
cooperation. (5) Definite plan Of
tack.
Under the first problem place the
,chnical details that enter into the
these can be known In their I
ltirety by well trained patholcg st I
hose knowledge extends beyond q
"a laboratory.
This man must not only understand 8
le factors entering into the treat e
ent OF the disease but he must be q
such a type and character that a
III at once place him as leader OF d
en- and an organizer. u
The next CREST step IN the work "
control - the question OF ade- CT
ate horticultural inspection, no
after how competent man may be b
leas he IN surrounded with prop 81
rules and regulations he is power c
y. ID