Hello everyone, and thanks to those who answered me about my problem on one of my gelatos, especially Phillindicus,Spinner Caribbean,and souljasam . One of my friends is an agronomist at one of our universities, As recommended by Philindicus Spinner Caribbean,and souljasam they advised me to cut the contaminated part and my friend took the cut sample and analyzed it, he found and identified botrytis cinereum spores and advised me to use a new generation natural fungicide. containing Bacillus subtilis QST 713, natural bacteria that are not genetically modified. This product, which is used for vegetables (tomatoes, salad, beans) does not cure the plant, it is better to use it preventively just before flowering , but stops the disease in case of infection, and treated vegetables are healthy. Good to know but very expensive product!
It can be applied as a foliar spray only, contains no chemical pesticide and allows a safe harvest after 1 days, I do the test with this plant I separated it from others because my friend told me that botrytis was very contaminating because of flying spores. just a stream of air carries them from one plant to another. It may allow me to save this plant and help other growers .I would just like to give some advice from my agronomist friend, botrytis penetrated by all the small wounds of the plant, even if it's very tempting, do not handle the buds to smell them or pinch the leaves to look closely, every time we risk injuring our plants and botrytis is waiting for this to enter.
I agree with Spinner Caribbean it's some type of fungal rot. I would locate a spot of healthy stem well below that point and cut off anything above that point and toss it. Look inside the stem of the cut make sure theres no brown or black coloring or cut a bit more off. You can use some ordinary grey modeling clay to plug the cut to keep bugs out. I would sterilze all tools in 1 part bleach 9 parts water. Let it soak for 5 to 10 minutes. Then rinse clean. Lastly you shoul do some defoliating try to open up the plant so more light and air can get at her. I've been seeing a lot of issue with this from grower in the northern areas where the cool nights are causing heavy morning dew to sit on the plants. The cool temps and moisture are perfect ingredients for fungal issues. I would keep an eye out for powdery mildew in the future. Hope this helps and you get some warmer weather.
Hope this works out for you a fellow grower in Thailand has some hot, humid,wet growing conditions struggles with similar issues. He has been using a Bacillus subtilis strain and has improved his grows.👍