Symptoms correspond to phyllody, which may be due to infection by phytoplasmas. Please see: http://www.apsnet.org/publications/plantdisease/2001/March/Pages/85_3_335.2.aspx

Hi : This is a phytoplasma (phyllody) symptom. Do you have treated with plant growth hormone?

 Yes it is a phytoplasma symptoms

Thanks all for you answers. Oadi Matny, we did not treat with any plant growth hormones. What can we do to treat infected plants or prevent further spread of this phyllody?

I don't think this is phyllody - I think it is vivipary, where the seeds germinate prematurely.  It happens occasionally in strawberries.  It may be a mutant deficient in ABA, or some exogenous factor.  It happens sometimes with tomatoes also.

Probably some leaves contain nematode specimens (Ditylenchus dipsaci) but the most important symptoms are not due to nematodes.

Dear Spesande Nomlala

the germination in fruits usually happens when the fruits are usually over ripe or the temperatures are high so under stress the seeds inside the fruits start to germinate.

 phyllody: instead of germination, it is actually the development of somatic leaf tissue in the place of embryo

 also due to infection by phytoplasmas.

 It can be caused by fluctuations in light, temperature, and nutrients available, also glyphosate spray for weed control caused phyllody

Pls. find the attached files

https://www.researchgate.net/publication/237658299_Occurrence_of_Noninfectious_Phyllody_Disease_of_Strawberry_in_Thailand

https://www.researchgate.net/publication/284342838_Phytoplasmas_in_strawberry_with_fruit_phyllody

Hoping this will be helpful

Regards

Prof. Houda Kawas

Article Occurrence of Noninfectious Phyllody Disease of Strawberry in Thailand

Article Phytoplasmas in strawberry with fruit phyllody

Symptoms correspond to phytoplasma.

میتونه باشه من روش تحقیق کاملی انجام ندادم که بخوام با قطعیت بگم ولی یکی از دلایل دیگه میتونه سم گلایفوسات هم باشه

At the 2004 International Strawberry Symposium in Australia, a paper was presented on the effect of the herbicide glyphosate on strawberry phyllody. Since glyphosate is the number one herbicide used by strawberry growers in Florida, she and Dr. John Duval designed a trial this season to look at glyphosate effects on the incidence of phylloid in strawberry. Three concentrations (0.001, 0.01, and 0.1 of the labeled rate) of the herbicide were applied one day or 4 weeks after transplanting on two different cultivars, Strawberry Festival and Camarosa. At the higher rate of 0.1 applied after transplanting, phytoxicity symptoms developed. Young leaves showed typical chlorosis and plants produced no fruit. At the 0.01 rate (9.8 oz./100 gal) applied after transplanting, plants showed no damage on the foliage, and flowers and young green fruit looked normal until the fruit started to ripen. Then green vegetative tissue developed from the seeds. At this concentration, approximately 40% of ‘Strawberry Festival’ and 50% of ‘Camarosa’ plants produced phylloid fruits. In the current season, a commercial field with glyphosate injury has shown an abundance of “brocco-berries”. Thus, if “brocco-berries” or “tassel berries” are seen in a field, first check to see if glyphosate has been used

We had the same symptoms when there is glyphosate remnants in spray tanks and/or glyphosate drifts on strawberry plants in farms and greenhouses of Kurdistan-Iran. The symptom depends on glyphosate rates.

Read more:

http://www.hos.ufl.edu/Vegetarian/05/February/Whidden.htm

I started a project to produce strawberries free of viruses, and when starting to collect samples of greenhouses and others found similar symptoms of the question and when detection and careful examination found nematodes, can benefit from the attached link

https://www.lsuagcenter.com/profiles/coverstreet/articles/page1486156213764

Best regards

Houda

Nice to see!.

https://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=17588

This is a phyllody, not vivipary. Herbicides such as glyphosate and 2,4--DB, can cause these symptoms.

https://www.researchgate.net/post/Any_suggestions_on_seed_germination_on_Strawberry_fruits_Why_did_this_happen