[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 BlightTVBNOW 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。7 Q" @6 g! n. 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 & K) t' p3 T6 e: Q( S
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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 tvb now,tvbnow,bttvb7 ~0 j6 g  j1 ~2 U- E% V5 c, U& V% L

in color and form concentric rings, or a 公仔箱論壇( N) R\" E$ t, b+ i
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bullseye pattern, as they grow. The area around the infection commonly turns yellow. As infections grow, , Z: y' R& N7 }; K4 A' C/ Q5 h

leaves may fall off. Extensive loss

of foliage is common. Infections most commonly occur on leaves but can also appear on stems and fruit.tvb now,tvbnow,bttvb+ f6 y1 Q3 h, s5 d! G1 _" j! \

How to identify Septoria Leaf Spot公仔箱論壇. J, J' i1 N! r1 h4 O, I

Symptoms of Septoria leaf spot also start 5.39.217.77:88984 v- M+ p+ K3 ^9 p/ M
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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,bttvb6 M: [! [2 d0 F: A6 B
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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. 6 N9 n+ O: }) _1 M5 u, f
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Small dark spots, the fruiting bodies of the fungus* e- o& C  S4 ]1 o% a7 G) K

, will appear in the gray or tan centers. As infections progress, leaves can turn yellow, then brown and finally dry ( }2 r. v2 u$ W) S: C. i
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and dead. Stems can also become infected but

infection of fruit is rare.5.39.217.77:8898+ P* T# F. u3 @9 V

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How to Prevent and Control Early Blight and

Septoria Leaf Spot公仔箱論壇6 _) c6 x; r0 a8 ?& g4 \, j6 D
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Follow the 12 easy steps below to enjoy a
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long season of sweet cherry tomatoes, colorful heirloom tomatoes and richly flavored sauce tomatoes.tvb now,tvbnow,bttvb8 a. \. ]0 Y$ Q" P8 _+ n  M# x
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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。' z9 f3 t# N. U: [

like nightshade, can host early blight and Septoria leaf spot and spread them to your tomato plants.5.39.217.77:8898& i4 U+ x: N. i* N4 C
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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 tvb now,tvbnow,bttvb0 g; j* o( k8 t

where tomatoes were grown.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。4 I7 A" I2 Z( _4 U% ]) [; R

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 ( W/ e  {3 l" J( _! V" Y0 i
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fungus from the soil to your 5.39.217.77:88988 {4 m& Z% M# k  U+ c
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plants.0 a9 ?: M* r4 C8 d' y
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Stake or cage plants to keep them tvb now,tvbnow,bttvb& J( O( g% z% v7 u4 j

off the ground. Early blight and Septoria leaf spot can survive on stakes and cages. Use only new or disinfected stakes and 5.39.217.77:8898' e- h5 L4 c1 s

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
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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. ( w4 ?$ @9 d$ Y
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 5.39.217.77:8898- v* r" w& [8 x2 f4 w- O- K

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
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plants are more susceptible to disease.
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Remove and destroy or throw away diseased leaves, both off the
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plantsplant and any that have fallen onto the ground. This may help stop the spread if caught early

enough. If a plant is heavily infected5.39.217.77:8898$ y* [3 y\" k; S. R% F  G; _/ c

, the entire plant should be removed and destroyed. Do not put infected leaves or plants in a compost pile. Tools used 公仔箱論壇" j* i! r2 P% m+ D0 j

to remove diseased leaves should be disinfected before being used on a different plant.5 z) w' ~7 f( v! ^1 w8 {

Spray plants to prevent and control the 5.39.217.77:8898$ }- M4 N\" c$ i1 B: i

spread of Early blight and Septoria leaf spot. Commercial fungicides are available. For organic gardens, try
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GreenCure.
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Late Blight on Tomato Plantstvb now,tvbnow,bttvb8 L8 R; Z" L1 R* @% E- s" o

Late blight is another fungus that infects tomato plants. It spreads fast and can quickly kill all tomato 公仔箱論壇; W4 b, D! i( I! Q
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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, 5.39.217.77:88984 V5 i- N% m) M( ?
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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

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

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