Tomato Spotted Wilt Virus

Insect-vectored disease spread by thrips. Most common in the southeast

Physical Description

 

Species & Taxonomy

  • Kingdom:
  • Phylum:
  • Class:
  • Order:
  • Family:
  • Genus Species:

Lifecycle

 

Plants Affected

  • Tomatoes
  • Peppers

Plants Unaffected

 

Geographical Range

Most common in the southeast

Signs & Symptoms

Whole Plant

  • black streaks on petioles or stems
  • growing tips are usually severely affected
  • systemic necrosis
  • greatly stunted growth
  • plant may exhibit one-sided growth
  • in peppers, long necrotic streaks appear on stems extending to the growing tips

Leaves

  • upper young leaves of tomatoes turn bronze and develop small dark spots or flecks
  • growing tips die out (dieback)
  • Peppers:
    • virus may cause sudden yelling and browning of young leaves which later become necrotic
  • Potatoes:
    • broad dark spots and necrotic ringspots, often with yellow-green halos, occur on both upper & lower leaves
  • Tomatoes:
    • young leaves may show small, dark brown spots and eventually die
    • dark brown streaks also appear on stems and leaf petioles

Flowers

Fruit

  • ringspots (yellow or brown rings)
  • other line patterns of yellow or brown
  • in tomatoes, immature fruit have mottled, light green rings with raised centers
  • in peppers, fruit formed after infection display large necrotic streaks and spots while younger fruit may be completely necrotic

Roots/Tubers

How to Positively Identify

Differentiate from curly top virus:

  • CTV does not cause bronze leaves or small dark spots or flecks on the leaves.
  • CTV also does not cause fruit to show
    •  concentric rings on both green and red tomatoes

Positive identification of the virus requires a lab, but if thrips are present in high numbers, it is likely that one of the viruses (curly top virus or tomato spotted wilt virus) are the culprit

Treatment

Prevention & Control

 

Cultural Controls:

Habitat:

Temperature & Humidity:

Mulching & Cultivation Practices:

Natural Enemies & Biological Controls

Insects:

Animals:

Reptiles:

Barriers

Traps

Sprays & Dusts

Sources:

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