Curly Top Virus in Tomatoes 2006

Planting date and variety both determine the success of a tomato crop when battling insect pests and disease. In 2006 a tomato trial was planted at the Mesa County Tri River Area Extension Office. Six tomato varieties were planted on three dates. Some tomatoes were placed under protective cover. Throughout the growing season the tomato plants were evaluated for symptoms of beet curly top virus (CTV).

Planting TomatoesMost of the tomato plants used in this trial were purchased from the local nursery, then planted in the field according to date. Black plastic as used for weed control. Ten plants of each variety were planted on 20 April.

Walls of Water


Walls of water were placed around five of the each tomato plant varieties, while the remaining plants were left open. Walls of water were removed on 15 May as plants grew to large to be contained.


Floating Row CoverThe second group of plants were put out on 11 May. On this date five plants from each variety were placed under floating row covers, while the remaining plants were left open. Five direct seedings of each variety were also planted on the 11 May.

The third planting date was 9 June. No alternative treatment was applied.

TomatoesThe tomatoes were evaluated several times between June 9-August 15 for symptoms of beet curly top virus. Plants determined to have be positive for CTV had slight discoloration, they were more yellowish in color, leaves had a rolled appearance, and over all health was poor.



The graph below shows the results of the evaluations. Variety was the main factor that determined weather a plant got CTV. Better Boy and Fantastic were more resistant then other varieties. Alternatives to the open treatment did provide some protection against the virus. Although walls of water were thought to bust plant vigor early in the growing season many plants contracted the virus.


This page was updated on April 26, 2014