[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

Symptoms of early blight typically begin on the older, lower leaves of a tomato plant. Over time, infections spread upward to

newer growth. Early blight infections appear as spots that may start out circular or irregular in shape. Spots are dark brown 5.39.217.76% C9 w0 X8 H' u3 G  K/ D+ Q
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in color and form concentric rings, or a 7 K: D5 s# e- |1 y- p; I! b
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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 公仔箱論壇) n( W2 @3 u  |% o& l& a5 Y! I& ?+ w

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 Spot5.39.217.76& ?- S6 P  w; k9 c+ v9 j1 k, p
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Symptoms of Septoria leaf spot also start ' o* \/ u+ N8 Q+ }& H
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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 9 I0 ?+ s! U& b. l

shape as they grow and can merge with other spots. Spots typically have a dark brown edge with a lighter gray or tan center. 公仔箱論壇  S: @! Z( d6 a% B8 v1 y- U) g: \

Small dark spots, the fruiting bodies of the fungustvb now,tvbnow,bttvb/ H& \2 i5 j5 g2 `7 w

, will appear in the gray or tan centers. As infections progress, leaves can turn yellow, then brown and finally dry
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and dead. Stems can also become infected but

infection of fruit is rare.

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How to Prevent and Control Early Blight and 5.39.217.763 ~! j: I4 h\" K

Septoria Leaf Spottvb now,tvbnow,bttvb7 A* y2 s5 ?& D
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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.

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。6 h' G- Q! G% s. t+ P

like nightshade, can host early blight and Septoria leaf spot and spread them to your tomato plants.
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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
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where tomatoes were grown.5.39.217.76& F; R/ q( m  }  f3 f0 r# A! E

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 公仔箱論壇! z6 x8 x4 i% m0 _

fungus from the soil to your 2 N& ~/ F) z/ f$ o, r- \
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plants.tvb now,tvbnow,bttvb- b9 c: O: d. @1 U% E: ^" i

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
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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 tvb now,tvbnow,bttvb! ^6 m' C4 y2 e4 i

space above the soil without any leaves. Do not use tvb now,tvbnow,bttvb: ]4 W, [, J6 m/ ~. ^. S
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overhead watering. 5.39.217.769 a- I" v7 K1 I0 g# i; [  h% f$ f& }
Avoid getting leaves and stems wet as much as possible and avoid watering in a way that may splash soil onto your plants.
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 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 ~; @: r; j7 r# q& e" I

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 * }4 t  q' J  p$ I+ f% L4 `

plantsplant and any that have fallen onto the ground. This may help stop the spread if caught early tvb now,tvbnow,bttvb) E. ~: u/ c0 J) J, \

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 5.39.217.76+ d. h3 m  a- k  B/ H& X1 E% C. u

to remove diseased leaves should be disinfected before being used on a different plant./ K5 K- p* {6 v" A1 \; q. i* F/ \
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Spray plants to prevent and control the % J3 E+ C; l9 P  i* A0 L+ G

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 Plants5.39.217.76( M. X( f# c8 N) v

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 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。. G3 ^' G3 X. i8 d0 }7 }0 \5 ^

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! q1 V+ {, T/ q) 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

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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