What is in this article?:
- Strawberry growers face losses from pallidosis disease
- Pallidosis disease symptoms
- PCA input
- Gomez crop damage
- Pallidosis management
- Several Santa Barbara County, Calif. strawberry growers are dealing with pallidosis-related decline disease in some strawberry fields this summer.
- Strawberry grower Jerry Cardenas of Santa Maria lost about $300,000 due to the disease by late July.
- Pallidosis is a viral disease which requires several viruses to combine to cause the disease.
CALIFORNIA STRAWBERRY grower Jerry Cardenas, left, Big J Produce, and pest control adviser John Gracia, AG RX, both of Santa Maria, examine plants affected by pallidosis-related decline disease of strawberry on Cardenas’ farm operation.
Pallidosis disease symptoms
The symptoms of pallidosis-related decline in strawberry include stunted plant growth, brittle roots, purple foliage, and the eventual death of the plant, according to Surendra Dara.
Dara is the University of California Cooperative Extension (UCCE) strawberry, vegetable, and IPM farm advisor in Santa Barbara and San Luis Obispo counties.
The extent of infection can vary from mild disease symptoms to total plant dieback.
Once inside the plant, viruses can remain systemic in the plant tissue. The plants must be removed.
For the disease to occur, one of two viruses must be vectored to the plant by the greenhouse whitefly, Trialeurodes vaporariorum: strawberry pallidosis associated virus or beet pseudo yellows virus.
Avocados, caneberries, grapes, lettuces, peppers, tomatoes, and ornamentals are hosts for the greenhouse whitefly.
Examples of non-whitefly transmitted viruses required for pallidosis disease to occur include: strawberry necrotic shock virus, transmitted by pollen; or strawberry mild yellow edge virus, transmitted by aphids.
Aphids are not typically a problem in strawberry.
No chemical product can prevent or control the disease; not even fungicides or soil fumigation.