[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
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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
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newer growth. Early blight infections appear as spots that may start out circular or irregular in shape. Spots are dark brown
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in color and form concentric rings, or a
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bullseye pattern, as they grow. The area around the infection commonly turns yellow. As infections grow, / g* d$ @* p3 A# ?$ a

leaves may fall off. Extensive loss
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of foliage is common. Infections most commonly occur on leaves but can also appear on stems and fruit.

How to identify Septoria Leaf SpotTVBNOW 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。& X$ E! i) B% N: b! }
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Symptoms of Septoria leaf spot also start

on the older, lower leaves of a tomato plant and spread upward to newer growth. The spots start out circular but change + F/ a! d4 [0 f8 x1 M, k4 @
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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. tvb now,tvbnow,bttvb* n: V, z. M) I2 t! X$ K

Small dark spots, the fruiting bodies of the fungus
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, will appear in the gray or tan centers. As infections progress, leaves can turn yellow, then brown and finally dry tvb now,tvbnow,bttvb1 T; o* c" a. E
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and dead. Stems can also become infected but 5.39.217.76# p. [! [. M& B# ]0 [: V: N4 x  a
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infection of fruit is rare.
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How to Prevent and Control Early Blight and

Septoria Leaf Spot
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Follow the 12 easy steps below to enjoy a tvb now,tvbnow,bttvb8 Z/ o; x: N# Z# z3 Y, ]  b
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long season of sweet cherry tomatoes, colorful heirloom tomatoes and richly flavored sauce tomatoes.5.39.217.76: A1 `! I# W; S/ Q" l
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Weed your garden. Some weeds, 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。: ]' D" J2 U* U4 `
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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 公仔箱論壇6 P. d# Z6 ?0 g& a+ @# z
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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
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fungus from the soil to your 7 B: m7 c! f7 l/ J

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 ) x; `& @, q: |# r% o2 D
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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

space above the soil without any leaves. Do not use tvb now,tvbnow,bttvb0 \$ Y6 _: @* Z

overhead watering.
Avoid getting leaves and stems wet as much as possible and avoid watering in a way that may splash soil onto your plants. % Y4 w/ [+ E' J
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 , f# p7 v* k: n8 n" y  {' |
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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 0 s7 Q: J! _# E* ?/ c+ F$ M+ k

wet. Keep your plants happy and healthy. Weak and stressed 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。2 Z3 h2 j0 w+ n% e' e0 u
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plants are more susceptible to disease.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。: V" P' u- `6 M6 M  a
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Remove and destroy or throw away diseased leaves, both off the 公仔箱論壇6 d! T9 q5 n  m, Z+ e' t3 g5 V
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plantsplant and any that have fallen onto the ground. This may help stop the spread if caught early + A( X7 U  g3 j& g7 G' j- T1 O/ C
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enough. If a plant is heavily infected$ z1 i! ^8 Q7 `* p8 G- Y

, the entire plant should be removed and destroyed. Do not put infected leaves or plants in a compost pile. Tools used tvb now,tvbnow,bttvb6 m7 k+ w9 q( B
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to remove diseased leaves should be disinfected before being used on a different plant.
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Spray plants to prevent and control the 公仔箱論壇7 \, O9 O! c. S# T' m9 \8 g0 s

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

GreenCure.
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Late Blight on Tomato Plants( M2 I9 W3 \  h" V6 B
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Late blight is another fungus that infects tomato plants. It spreads fast and can quickly kill all tomato
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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, " w$ ?1 u6 K2 D* R
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。/ V3 k5 n! x5 Y0 G' R5 s' ^2 C
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
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can infect all parts of a tomato plant, including the fruit. Most of the methods for preventing early blight and 5.39.217.765 S* r8 Z! B; {5 o9 D7 w

Septoria leaf spot infections will also help prevent late blight infections.

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