BROWNING PLANTS FROM THE CENTERS OUT!
We have an outdoor garden with 40+ plants that in the past week are all looking funky on the insides. Almost all of the inner leaves and small sprigs closest to the main stalks started yellowing, then browning and dying. Some are dying in a way that looks kind of like a nutrient deficiency because they have crisp brown on the edges followed by soft yellow tissue and green, healthy tissue still in the middle. Other leaves turn all yellow then all brown. Overall the plants still look vibrant and healthy and at first you couldnât see the problems on the inside without pushing outer branches away to peer into plant. Now the dying leaves seem to be spreading farther up the branches. There are even a few browning leaves close to the tops of our biggest branches. Now you can see the dead leaves just by standing back and looking. In general the plants still look healthy on the outside but we are afraid the problem will continue to creep its way up. The healthy looking leaves near the tops of the plants do have a very fine brown/black outline all along their edges (see picture).
Dug down the sides of our pots today and the roots looked healthy and the soil didnât smell like rot or fungus. No pests are visible in the soil.
Stalks of plants and large branches seem solid and healthy although there is some dark brown coloring which we think is staining from grandevo or nutrient foliar feeding?
We probably had broad mites last year in the same garden but we got all new pots, soil, and tools. Reinfection is a possibility but our game-plan has been hyper-prevention: we sprayed with forbid a few times early in the season (a bummer but true) then switched to alternating grandevo and green cleaner 8 weeks ago. We are using stihl backpack sprayers and spraying about once a week. Itâs been aggressive but there havenât been any conclusive signs of mites and until now the plants were growing fast and healthy so it felt like we were winning. We coated plants with diatomaceous earth at the end of July to control cucumber beetles and many leaves (especially interior) still have a white residue on them that wonât come off even with a water rinse.
Strain; All are local crosses that have done well in our climate: ârussian kush X trainwreckâ âblack cherry cheesecakeâ âpeaches and creamâ âfloydâ âpeachy pineâ
Outdoor Soil in pots: Roots organic original- 200 gal pots.
Temps; Day ranging from mid 80âs to last weekâs 100âs. Night mostly 60âs
Humidity; Really low
Things we think could be the problem: Fusarium, Verticillium, burning from the aggressive spraying, smothering from the diatomaceous residue, or some other undiagnosed infection.
Please give us your 2-cents about what could be the problem and how we can heal it. We really appreciate the community knowledge and support! Thank you! Save the weed!
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