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.