[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

can start at any time. Infections can occur anywhere and are most severe in wet and humid areas.- W- [5 |+ O8 o
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How to identify Early Blight
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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 5.39.217.76# l- \9 z: D) [5 V7 P

newer growth. Early blight infections appear as spots that may start out circular or irregular in shape. Spots are dark brown tvb now,tvbnow,bttvb6 D; W# q% B% w- B2 U3 j9 f2 p

in color and form concentric rings, or a 3 B! [: z) |& y! p\" [: p
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bullseye pattern, as they grow. The area around the infection commonly turns yellow. As infections grow, tvb now,tvbnow,bttvb3 R4 v# Z8 _5 d  Q

leaves may fall off. Extensive loss TVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。; m! m0 V/ P' Y+ q% s

of foliage is common. Infections most commonly occur on leaves but can also appear on stems and fruit.6 Z; V' c7 ^1 v/ r- X" K! M2 `, _( j

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How to identify Septoria Leaf Spot
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Symptoms of Septoria leaf spot also start tvb now,tvbnow,bttvb/ V% w; z" t1 q7 e

on the older, lower leaves of a tomato plant and spread upward to newer growth. The spots start out circular but change tvb now,tvbnow,bttvb" T, z- K* K' U  n! i' Q
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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. TVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。0 X4 f2 Q2 }3 F# p

Small dark spots, the fruiting bodies of the fungustvb now,tvbnow,bttvb7 _1 R; @5 g; n5 Y$ V) ?+ y

, will appear in the gray or tan centers. As infections progress, leaves can turn yellow, then brown and finally dry TVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。/ i2 A9 t; z& X; d& L4 r
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and dead. Stems can also become infected but
TVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。\" t: U5 n. Z' K' p: e2 @9 |
infection of fruit is rare.

How to Prevent and Control Early Blight and

Septoria Leaf Spottvb now,tvbnow,bttvb& g, x8 O' V" C2 [

Follow the 12 easy steps below to enjoy a

long season of sweet cherry tomatoes, colorful heirloom tomatoes and richly flavored sauce tomatoes.) U' F$ d* X4 a3 ?

Weed your garden. Some weeds, 5.39.217.769 S: i& b0 B3 J' a- e. q# t! M6 I. `: i
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like nightshade, can host early blight and Septoria leaf spot and spread them to your tomato plants.5.39.217.76/ f6 f* ]1 n8 w/ O$ \- p
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Rotate crop locations. Don’t

plant your tomatoes in the same place each year. Early blight and Septoria leaf spot can persist for multiple years in areas : s/ R' V0 Y( P0 ^. d
TVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。5 U7 S# \, e3 {' a* D( W2 e
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

fungus from the soil to your 公仔箱論壇  Z& ^0 }6 b" u+ e6 S( r' P/ k$ d. r. Y
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plants.
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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 9 [7 N. G1 d9 e( C. M! k4 P

cages. Remove lower leaves for better airflow. As plants mature, remove lower leaves until there is about 8 to 10 inches of 5.39.217.764 O0 C8 a0 X7 S7 O% y% F2 C

space above the soil without any leaves. Do not use
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overhead watering. # N' o. R, t: V; J% q2 a
Avoid getting leaves and stems wet as much as possible and avoid watering in a way that may splash soil onto your plants. $ [9 W( c! h8 y5 {8 Z
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
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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

plants are more susceptible to disease.

Remove and destroy or throw away diseased leaves, both off the 0 d& y9 h  U\" V+ Q' @7 q

plantsplant and any that have fallen onto the ground. This may help stop the spread if caught early

enough. If a plant is heavily infected

, the entire plant should be removed and destroyed. Do not put infected leaves or plants in a compost pile. Tools used
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to remove diseased leaves should be disinfected before being used on a different plant.公仔箱論壇9 L* ?. s2 o9 R& d/ w, b

Spray plants to prevent and control the

spread of Early blight and Septoria leaf spot. Commercial fungicides are available. For organic gardens, try + ]( H) K% l5 p$ p8 a

GreenCure.tvb now,tvbnow,bttvb2 e! e, ]3 d8 g" \! w% w

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Late Blight on Tomato Plants
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Late blight is another fungus that infects tomato plants. It spreads fast and can quickly kill all tomato tvb now,tvbnow,bttvb9 g0 P7 U. v1 ^* \

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,

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 blight5.39.217.76+ v1 [' H  }% Z1 M& U# g

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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