[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 5.39.217.77" p7 l% w1 O, G$ O7 F2 w- o

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 3 a- g- v5 u: E- B. O; G7 s1 c2 L% K
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bullseye pattern, as they grow. The area around the infection commonly turns yellow. As infections grow,

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。3 V/ \5 G; O5 P6 ~

of foliage is common. Infections most commonly occur on leaves but can also appear on stems and fruit.

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How to identify Septoria Leaf Spot公仔箱論壇8 r; \- ~3 x0 c; I0 @" A1 `

Symptoms of Septoria leaf spot also start 5 K5 ?2 G, o- Z! b* h( |! Y: 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

shape as they grow and can merge with other spots. Spots typically have a dark brown edge with a lighter gray or tan center. ' _2 }1 o3 Y. j8 L( v" \2 x6 U
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Small dark spots, the fruiting bodies of the fungus\" ^+ Y+ e( M& J5 p1 w! T5 X- l
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, 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 tvb now,tvbnow,bttvb: z/ y2 h, z5 {' L1 C9 ?9 _5 X

infection of fruit is rare., z% X; a, s1 Q" d( N4 S: S

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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 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。% Z. O7 T8 U! c' L6 s6 r+ `
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long season of sweet cherry tomatoes, colorful heirloom tomatoes and richly flavored sauce tomatoes.5.39.217.77; a" R( p* [: b6 u! D! x/ T" u7 o# g
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Weed your garden. Some weeds,

like nightshade, can host early blight and Septoria leaf spot and spread them to your tomato plants.tvb now,tvbnow,bttvb% d7 z4 T+ n) ?; u2 k. {
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Rotate crop locations. Don’t 4 w7 n" h7 t* J7 d+ G

plant your tomatoes in the same place each year. Early blight and Septoria leaf spot can persist for multiple years in areas 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。, i: h; J/ Q; n% k% K4 f$ u$ w
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where tomatoes were grown.0 U3 J% l/ @3 j' ]

Give your tomato plants more space for better airflow. At least 2 feet of spacing, more is better.公仔箱論壇5 ]" Q. a9 B- k1 G& b
Cover the ground beneath your tomato plants with mulch, plastic or landscape fabric. A cover helps prevent the spread of . b1 r9 X( h5 m
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fungus from the soil to your

plants.tvb now,tvbnow,bttvb/ V4 s& _5 D# ]5 I* }4 `/ N

Stake or cage plants to keep them tvb now,tvbnow,bttvb4 d& T* O1 {/ d" c

off the ground. Early blight and Septoria leaf spot can survive on stakes and cages. Use only new or disinfected stakes and
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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 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。1 d1 o& u; p$ U5 O5 o1 Z

space above the soil without any leaves. Do not use
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overhead watering. $ s! \7 O* z! n! a7 u
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,bttvb) g$ X8 Q0 s' H. R3 E7 J) p
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) }, `' R9 N; L, r  g9 n

fungus to grow and spread. Avoid working with plants when they are wet. Fungus can be spread more easily when leaves are 公仔箱論壇/ i" K4 P+ a! l; l
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wet. Keep your plants happy and healthy. Weak and stressed

plants are more susceptible to disease.tvb now,tvbnow,bttvb5 i7 x: A- C. k
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Remove and destroy or throw away diseased leaves, both off the

plantsplant and any that have fallen onto the ground. This may help stop the spread if caught early
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enough. If a plant is heavily infected
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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

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

Spray plants to prevent and control the tvb now,tvbnow,bttvb' b) F4 {6 o0 \\" ^

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 Plants
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Late blight is another fungus that infects tomato plants. It spreads fast and can quickly kill all tomato * O: J- D& b3 e& F# r7 O
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plants in a garden. Once a tomato plant 6 E: v% ~* X& L- |9 Y
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is infected with late blight, the entire plant should be removed and destroyed. Late blight infections first appear as small, tvb now,tvbnow,bttvb8 x4 x' U3 k: K8 L

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 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。, |' a3 o* l5 _2 q* u6 x: v

can infect all parts of a tomato plant, including the fruit. Most of the methods for preventing early blight and tvb now,tvbnow,bttvb# {  C+ g( G( e! n! T! W

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

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