Transplantei as mudas para os vasos definitivos dia 20 agora deste mes, e hoje notei ja alguns malditos gnats!
Solo novo de outro fornecedor e tudo e eles estao aparecendo novamente. Hoje notei alguns voando perto do solo.
Existe algum produto que acabe com eles definitivamente?
Queria ja combater antes que vire uma infestação.
Eu so reguei abundantemente no dia 20 qnd transplantei e nao reguei mais elas, solo ainda parece úmido mas nao muito. Aqui a umidade é altíssima, em torno de 75 a 85%.
Talvez eles vem de algum terreno ou vizinho proximo eu suspeito.
Quais sao as melhores praticas e produtos que vocês usam para eliminar eles do solo?
I only understand a little Portuguese but I think I get it.
It’s hard to completely get rid of gnats. But your best option is to get this product called “Mosquito Bits”
it’s organic, and it targets mosquito and gnat larva. It’s meant to be used in soil and stagnant water.
you can sprinkle it on top of your soil, or you can put it in your water reservoir if you are growing hydro.
It should noticeably reduce a bad infestation, but you will find it is hard to eliminate them completely. Most grows have a few fungus gnats flying around.
If you are growing indoor or in a greenhouse, the other thing you should do is increase airflow in your grow. Get a fan blowing directly over the surface of your pots, this will prevent the gnats from landing or taking off. Any that hatch from your soil will be stuck there, and any flying around won’t be able to land and lay eggs.
also get some air blowing directly on your buds, to prevent gnats from landing on the buds.
So you’re best options are increasing air circulation, and using the mosquito bits (also called Mosquito Dunks, same thing)
you might still have a few gnats left, but this will pretty much get rid of the infestation.
1 cup hydrogen peroxide to a gallon of water. Spray all around the edges of your medium and the drainage holes and they will die or move on after 2-3 days of spraying
O pessoal aqui já deu boas dicas, quando preciso lidar com gnats gosto de combinar as armadilhas amarelas junto com uma boa cobertura de matéria seca sobre o vaso… Essa cobertura precisa cobrir toda a superfície do vaso com uma folga para que as moscas não consigam ter acesso ao solo e as larvas não consigam eclodir para o meio externo. Na minha visão é a maneira mais natural e certeira de acabar com o problema. Quando precisar regar é só retirar a cobertura e colocar novamente depois, essa cobertura pode ser feita com alfafa, feno de coelho, argila expandida, areia etc.
People here have already shared some great tips. When I need to deal with gnats, I like to combine yellow sticky traps with a good layer of dry material covering the soil in the pot. This cover should completely cover the surface of the pot, with no gaps, so the gnats can’t reach the soil and the larvae can’t emerge into the open air. In my experience, this is the most natural and effective way to get rid of them. When it’s time to water, just remove the cover and put it back afterward. You can use things like alfalfa, rabbit hay, expanded clay or sand as the top layer.
The key with fungus gnats is… don’t ever get them in the first place haha jk but seriously there are a few methods that keeps them at bay. Sticky traps will catch the adults flying around and BT soil drench a couple of times will eliminate the larvae. They are stubborn little bastards so usually takes multiple attempts. people mention sand on top of the soil and DE but not really addressing the issue long term
I was watching a couple videos on youtube in english and I saw a girl also recommending this mosquito bite product you mentioned. She also mentioned the same, using it over the soil or making a tea from it with hot (not boiling water)
I am growing indoor for the first time in my life. I have always grown outdoors and never had to worry too much with pests or ph before.
Regarding ventilation, I am using a large desk fan that can move a lot of air actually, I even had to move it a little further yesterday as the plants are starting to reach the fan height and that possibly isn’t too goof for the plants either, right?
The humidity levels here where are live is insane. Usually around 75% to 85% on sunny and windy days, since it is very near the beach. I notice when turn the fan off the humidity goes up 10% straight away. Keeping that fan on there reduces it to 75%.
I haven’t finished building my tent yet. My plan is to finish the build soon after the 31st when I am off work. But I am sure going to need a dehumidifier to try reducing the humidity in that room to at least 60%.
Here in Brazil I probably will not find that Mosquito Bite brand, but hopefully the fellow friends from Brazil here will be able to help me find a similar alternative.
Is GNATERIZER 3000 a product? Just tried looking it up on google and didn’t find anything.
Yeap! I don’t usually over water my plants. But since I moved the plants from the 500ml cups to their final 10L vases and the soil mix I prepared was very dry, I though I had to water them abundantly because of the vase transplant.
From I what I recall from my annotations and pictures from that day, I think it was on the 20th. Even though the soil mix was very dry I only added about 600ml of water to each 10L vase.
From what I recall from that day, there vases didn’t even drip at the bottom. I was even thinking I wasn’t adding enough water. When I have outdoor plants on vases I usually water until water starts to drip from the bottom, and this time I didn’t. But perhaps 600ml was a bit too much. Also having in mind that the air way too humid here.
Thanks for input! I probably wont find the exact same product you suggested here in brazil, but i will try find a similar product with that composition. Thank you!
That sounds good. I have hydrogen peroxide here and I can start that tonight even. Sounds like a cheap and easy resolution.
Good call! I received a couple organic fertilizers today and I totally forgot to buy yellow traps and andiroba oil.
Would rice husk work as the soil coverage? Not really right? I tried the sand trick once I bought a soil that was infested with gnats. It kinda worked but I had to add like 2inches of pure sand over the soil and the plants didnt like that, it was hard to water and also hard to have an idea of how wet or dry that soil was.
True! I am not sure these bastards are still here from a bad soil I once bought and thought they were gone for good or if there are already infesting some other plant I have in from of the house.
the soil I used this time was completely different from another brand and store and it was very dry when I premixed it. The cannabis plants are indoor and far from my front garden. Not sure these gnats found my indoor plants these last three days or if they were already in this new soil I bought. I really mixed it very well and it was very dry then, I looked a lot for the gnats when mixing it by hand. I’m really not sure.
All this indoor learning is already very challenging lol. I never had to worry about pest or having to ph water or check ph of the soil before
Can they fly far? Do you think they could also be coming from some other plant in a vase from the front yard? my growroom is at the rear of the house. Maybe they found the new soil these days and since its a very good condition for them there they are migrating also?
I was just reading here about nematodes (nematoides em portugues) and I dint know those were some kind of good parasites that eat gnats larvae. Sounds like a good plan. Do you guys here from Brazil know where I could find that?
I was also reading now about terra diatomacea (diatomaceous?) a atoxic powder that also helps combat larvae, insects and alike. But from what I just learned this would also kill the good nematodes parasites, right? What would be ideal to start with?
If the diatomaceous is going to kill the nematodes parasites that are feeding from the gnats larvae it would be ideal to use one or the other, correct? Or I would have to start with one and later use the other?
Yes, especially if you use organic soil, I do not like to apply anything directly to my soil so as not to kill the beneficial microorganisms that live there, I apply via foliar with andiroba oil as a prevention.
I have seen growers using sand or perlite on top of the substrate so that they do not place more larvae and use yellow glue as a trap, I believe it is the least harmful option for plants and substrate.
Always remembering to remove all sand or perlite before a new watering and then reattach.
Queria compartilhar umas paradas que aprendi aqui no meu primeiro cultivo, ainda tô no começo da caminhada, mas talvez te ajude de algum jeito.
Tô no dia 24 de Vega e tô passando pelo mesmo perrengue com as gnats que você comentou.
Tudo começou quando misturei um pouco de substrato que veio com minhocas californianas no meu solo vivo… e, mano, não deu outra: infestação brutal.
Parecia que tinham brotado umas 100 mosquinhas do nada.
Ainda tô na luta, mas já consegui reduzir MUITO o número delas depois que fiz algumas ações. Se liga:
Removi a camada superficial do substrato que tava visivelmente contaminada (a terra que veio com as minhocas). Só isso já fez bastante diferença na eclosão de novas larvas.
Espalhei armadilhas de cola em tudo quanto é canto — parece exagero, mas quanto mais, melhor.
Posicionei um ventilador oscilante perto das plantas pra atrapalhar o voo delas até o solo.
Fiz uma medida meio polêmica (mas eficaz): liguei um repelente de tomada no cômodo do grow por uns 40 minutos, dia sim, dia não. Cara, matou várias quase instantaneamente (mas não teve quase nenhuma eficiência com as larvas).
Tô alternando aplicações de óleo de neem e óleo de andiroba, borrifando nas plantas e no solo a cada 3 dias.
Depois de uma semana puxada, te digo: não tá 100% resolvido, ainda tem gnats no grow (umas 20). Mas a infestação caiu MUITO — uns 90%.
O que percebi é que o segredo mesmo é prevenir, porque depois que elas entram… já era, vira novela.
A boa notícia é que, apesar de serem chatas demais, se você mantiver o controle, elas causam bem pouco ou quase nenhum dano real às plantas — o maior problema é o incômodo mesmo.
Ah! E outra coisa que vou fazer agora é trocar a cobertura de palha por feno orgânico de coelho. Depois de bastante pesquisa vi que o feno faz uma barreira mais firme, dificulta a saída das larvas e atrapalha as fêmeas de botarem ovos de novo.
Enfim, espero que te ajude de alguma forma! Vai ter que lutar o combate mano e vai demorar pra resolver. Boa sorte!
Consegui acabar com uma infestaçãozinha de gnats, mas foi nos vasos sem plantas ainda. Eu fiz o seguinte, tratei os vasos com Bacillus thurigiensis, aqui no Brasil você compra como dengue tech, dilui meio comprimido em 5l de água e daí rega uma vez por semana com essa água, eu liguei o Led pra secar o topo Tb nesse meio tempo. Antes do bti chegar eu usei terra de diatomáceas no topo do solo, deixei tudo branco, não acabou com as larvas mas ajudou bastante antes de chegar o dengue tech.
Hoje tem 0 gnats já faz mais de um mês, demorou 3/4 semanas pra nenhuma mais eclodir, tratei 70l de solo.
I was able to exterminate them with dengue tech (similar to mosquito bits). I applied it every 7 days, half a pill into 5l of water. In 3/4 weeks I was able to treat 70l of soil, no gnats left but the soil didn’t have any plants on it, so I was able to always leave the top soil dry (let the led on for a while so it would dry in between the applications.) I have literally 0 gnats now! You can keep applying dengue tech every month as well to prevent, it’s 100% organic and it doesn’t affect the soil or create any resistance.
I will add a few things that helped me with gnats:
Water your plants from the bottom only. This means, if you have the plant in a pot on a saucer, pour the water into the saucer and let the plant take up the water from there. Soil can wick water very well and no watering on the top of the soil is necessary. The top of the medium will not become overly wet using this technique.
A soil that has a lot of “forest products” in it (like tree bark or sticks) is more attractive to fungus gnats. Avoid this type of soil.
Don’t keep an opened bag of soil around, fungus gnats can easily become established there even if the soil is not in use.
Sand was annoying to cover the top of the pots with. I settled on using lava rocks (pumice) to cover the soil. I think rice hulls would work well.
Removi a camada superficial do substrato que tava visivelmente contaminada (a terra que veio com as minhocas). Só isso já fez bastante diferença na eclosão de novas larvas.
Espalhei armadilhas de cola em tudo quanto é canto — parece exagero, mas quanto mais, melhor.
Posicionei um ventilador oscilante perto das plantas pra atrapalhar o voo delas até o solo.
Fiz uma medida meio polêmica (mas eficaz): liguei um repelente de tomada no cômodo do grow por uns 40 minutos, dia sim, dia não. Cara, matou várias quase instantaneamente (mas não teve quase nenhuma eficiência com as larvas).
Tô alternando aplicações de óleo de neem e óleo de andiroba, borrifando nas plantas e no solo a cada 3 dias.