[生活小百科] Early Blight and Septoria Leaf Spot on Tomato Plants

Early blight and Septoria leaf spot infections most commonly begin in the early or middle part of the growing season but
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can start at any time. Infections can occur anywhere and are most severe in wet and humid areas.
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How to identify Early Blight公仔箱論壇0 K  _% {3 v- ?4 n
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Symptoms of early blight typically begin on the older, lower leaves of a tomato plant. Over time, infections spread upward to % p' Q5 s# v3 j1 W4 u7 j1 U  g  U

newer growth. Early blight infections appear as spots that may start out circular or irregular in shape. Spots are dark brown

in color and form concentric rings, or a tvb now,tvbnow,bttvb% u7 p, D1 b& n! l. }* H4 }

bullseye pattern, as they grow. The area around the infection commonly turns yellow. As infections grow, # ]* v$ x; }9 n' `& t/ ]: G

leaves may fall off. Extensive loss

of foliage is common. Infections most commonly occur on leaves but can also appear on stems and fruit.5.39.217.76! {; z6 g8 L. K0 e# F/ q# ]! F3 d

How to identify Septoria Leaf Spot

Symptoms of Septoria leaf spot also start 5.39.217.764 w( ^# n. Y$ L; f

on the older, lower leaves of a tomato plant and spread upward to newer growth. The spots start out circular but change
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shape as they grow and can merge with other spots. Spots typically have a dark brown edge with a lighter gray or tan center.

Small dark spots, the fruiting bodies of the fungus5 A. \% ~) z4 x1 f% V6 u

, will appear in the gray or tan centers. As infections progress, leaves can turn yellow, then brown and finally dry

and dead. Stems can also become infected but
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infection of fruit is rare.5.39.217.76# I+ z! C. S( \, w) [
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How to Prevent and Control Early Blight and

Septoria Leaf Spot. K; N1 Z0 S+ C# n
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Follow the 12 easy steps below to enjoy a

long season of sweet cherry tomatoes, colorful heirloom tomatoes and richly flavored sauce tomatoes.tvb now,tvbnow,bttvb: P2 M9 z8 [5 m: H8 o$ _

Weed your garden. Some weeds,
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like nightshade, can host early blight and Septoria leaf spot and spread them to your tomato plants.

Rotate crop locations. Don’t
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plant your tomatoes in the same place each year. Early blight and Septoria leaf spot can persist for multiple years in areas

where tomatoes were grown.
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Give your tomato plants more space for better airflow. At least 2 feet of spacing, more is better.
Cover the ground beneath your tomato plants with mulch, plastic or landscape fabric. A cover helps prevent the spread of tvb now,tvbnow,bttvb. y+ R: f) _- I( b5 x3 t1 s" V

fungus from the soil to your tvb now,tvbnow,bttvb! J% i+ r8 N3 O! m$ a+ I
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plants.

Stake or cage plants to keep them

off the ground. Early blight and Septoria leaf spot can survive on stakes and cages. Use only new or disinfected stakes and ( E& r- k! |! o! t! R" I; N/ @
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cages. Remove lower leaves for better airflow. As plants mature, remove lower leaves until there is about 8 to 10 inches of # {  r4 m" B3 a  r  [0 j$ Z) d( V/ ~

space above the soil without any leaves. Do not use 8 u+ n  _+ U* b) m) ~- q  y$ {  `. _
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overhead watering. + c. Y6 L$ s/ _6 z8 c* N  F
Avoid getting leaves and stems wet as much as possible and avoid watering in a way that may splash soil onto your plants. tvb now,tvbnow,bttvb1 D% g) I& L8 B: K$ `4 W! s6 [
Consider using a soaker hose or drip tape. Water in the early part of the day. This allows leaves to dry faster. Wet leaves allow ) W! I$ x; n3 |. l

fungus to grow and spread. Avoid working with plants when they are wet. Fungus can be spread more easily when leaves are
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wet. Keep your plants happy and healthy. Weak and stressed ) f* w0 m( O9 U7 b
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plants are more susceptible to disease.公仔箱論壇8 \9 c* d3 W0 t( X2 o6 o& P* P7 a
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Remove and destroy or throw away diseased leaves, both off the 公仔箱論壇2 v/ D. N7 R, u* _3 K  p

plantsplant and any that have fallen onto the ground. This may help stop the spread if caught early ! N6 D! p7 t# g  Y. n' R
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enough. If a plant is heavily infected) q  c; G6 ~2 s% A3 k
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, the entire plant should be removed and destroyed. Do not put infected leaves or plants in a compost pile. Tools used : ?' b9 K2 z0 s

to remove diseased leaves should be disinfected before being used on a different plant.

Spray plants to prevent and control the

spread of Early blight and Septoria leaf spot. Commercial fungicides are available. For organic gardens, try

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Late Blight on Tomato Plants5.39.217.76* D5 e3 p4 e( B2 e7 E" M/ j
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Late blight is another fungus that infects tomato plants. It spreads fast and can quickly kill all tomato   a6 k) [* n$ J
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plants in a garden. Once a tomato plant
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is infected with late blight, the entire plant should be removed and destroyed. Late blight infections first appear as small, 公仔箱論壇5 ^( Z* ]# i8 h1 _* \1 J! \

water-soaked spots on leaves and stems that grow and turn dark brown or gray. A white downy growth may develop on the underside of infected leaves. Late blight/ \3 m\" I\" u' w& e, \; G
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can infect all parts of a tomato plant, including the fruit. Most of the methods for preventing early blight and
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Septoria leaf spot infections will also help prevent late blight infections.

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