Welcome to the Growery Message Board! You are experiencing a small sample of what the site has to offer. Please login or register to post messages and view our exclusive members-only content. You'll gain access to additional forums, file attachments, board customizations, encrypted private messages, and much more!
Hi. I have been doing a grow up lately. I have started from my own seeds and I'm actually growing them to make some clones for outdoor grow. the plants look healthy overall but there are some yellowings on some of the leaf tips. my guess is that they happened because the lights were too close to the leaves or maybe that's because of nutrition deficiency. I'm not sure. I'm using 2*400W MH lights and I keep temp at 23-24 C degrees. I have attached some pics. any Ideas or thoughts? Thanks.
While I'm not the most experienced person here who can help you with your plant problems, I can tell you that unless this effect is much worse on the top leaves (the pictures look to be of some lower leaves on the plant), then it's definitely not light burn. Light burn will be more pronounced on foliage that's closer to the light.
That being said, a lot of nutrient deficiencies can't be accurately diagnosed without giving the users here a little more technical data about your grow. Please copy the questionnaire in This Thread, and answer it to the best of your ability. Remember that part of growing is experience and a keen eye, and the other is science, and that without information we can't perform the scientific function of narrowing down an accurate diagnosis for you.
Thanks for coming here for your growing questions, if you can get us that info we need, one of our more experienced growers will be along shortly to help you out. We hope you'll stick around and maybe post a Grow Log so we can get a good look at your plants from start to finish and help to point out any potential problems that may arise along the way. Also, if you like to chat while you burn one, check out the smoke lounge.
Cheers!
-------------------- “The Universe is under no obligation to make sense to you” -NDT
Sometimes called "yellow leaf spot" or "leaf septoria," this condition is caused by a fungus (or sometimes a bacteria) that attacks cannabis plants and usually appears in warm, wet weather. The symptoms first appear on the bottom leaves of the plant.
The spots may have darkened borders and may have a hard growth in the middle like a little pimple, but the thing that makes the spots the most unique is they are often very uniform, like little circles. Each spot is the receptacle of a spore (ewwww) which look like tiny dark specks in the center of each spot.
Although the spots often appear yellow like in the picture below, they will start turning brown over time. So if you see round brown spots on your cannabis leaves it could also be caused by leaf septoria.
This fungus spores may stay in the soil over the winter, and attack your plants in the summer. Spores are also easily spread by wind and rain.
Immediately (and carefully) remove all affected leaves to get rid of as many spores as possible. Prune any leafy parts of the plant to improve circulation through the plant Avoid getting water on the leaves or laying on top of each other - you want to avoid moisture Make sure to keep the ground under your plant clean. Rake away all leaves and vegetation. Adding mulch can also help prevent spores from spreading. Keep plants healthy, sicks plants are much more susceptible to leaf septoria than healthy plants One way to help prevent this fungus from attacking your plants is to rotate crop sites or move to a new location every year. A copper based fungicide or a broad spectrum fungicide may be effective at stopping the fungus from spreading though they are best used as a preventative. Depending on exactly what's causing your leaf spot, Neem Oil may be used to help combat the problem. Neem Oil will leave an unpleasant taste/smell on buds when used to treat flowering plants, so don't let this stuff get near your buds! You will need a mister (also called a "One-Hand Pressure Sprayer") to spray all the leaves evenly, since neem oil and water can separate easily. Try spraying just a small part of the plant and see how it reacts first before spraying the whole thing.
-------------------- All creatures tremble when faced with violence. All creatures fear death, all love life. If we can only see ourselves in others, then how could we possibly hurt another creature?
http://www.greenmanspage.com/plant_abuse/ Magash is right the soil plays a big factor, I just started to add beneficial nematodes to my mix, they eat and go after bacteria keeping you soil healthy. Micronutrients are also beneficial to your soil mix. Look under the leaves for mites. Humidity is another factor that can create mold spores while most are white powder mildew some yellow and some rust is caused by fungus as well. I posted a link on deficiencies as well because it could also be a nutrient issue like lock out or just not getting what she needs. I have a 1000watt switchable I use both MH and HPS my girls like it at 26 degrees Celsius and never burnt my tips from that. What strain? What's the humidity at? There are so many factors to this but it's all part of the learning. Hope we are of some help, btw they don't look too bad.
Threaded
Previous
Index
Next
Some of these posts are very old and might contain outdated information. You may wish to 
Edit 
Reply 
