Powdery mildew or white powdery mildew originates from various types of fungi. The challenge comes when it appears as greyish white powder reflected on the green areas of leaves, particularly on the areas of growth. Powdery mildew appear as spots and spread quickly around the marijuana plant.
The major difficulty is when it dangerously affects the photosynthesis of cannabis plants and hence, damages the whole batch of it. Powdery mildew is extensively transmissible due to which it should be cured as soon as you spot it. This problem is ordinary as compared to other fungal attacks and so it should be monitored timely.
Signs of Powdery Mildew
Plants affected by powdery mildew show frizzy, wheatish, round spots on their leaves. They may also appear dappled, blotchy, and withered. This fungus out-spreads rapidly and hence destroys the whole crop. Powdery mildew is identifiable because of its sharp outline of white on green, and therefore, it can easily be separated using proper techniques if identified at the right time. Airborne spores are highly problematic since it gets hard to manage their rapid spread.
Avoiding Powdery Mildew
Appropriate steps should be taken to avoid the storm of powdery mildew. Marijuna plants should be sown by maintaining extra space in between them. While watering the plants, give enough time for them to absorb the light (i.e. natural or artificial), so that no humid environment is created which acts as a favourable factor for the mildews to grow. Leaves on the bottom of the marijuana plants do not receive proper light because of shade and hence, they should be pruned. This way the growth of the mildews is prevented as well as it increases the effectiveness of leaves to make use of proper lighting and nutrients.
Treating Powdery Mildew
Preventive measures can be taken by employing adequate treatment methods to avoid the attack of powdery mildew. One of the ways is to use half a teaspoon of baking soda with a quarter of a gallon of water. Other alternatives include spraying marijuana plants with different oils, such as, neem, sesame or fish oil. These sprays also help combat fungal attacks. The best measure is to use milk spray mixed with water in a 40:60 ratio. It is considered as the best alternative due to its antiseptic property as the presence of protein in the milk reacts with sunlight leading to antiseptic production, which eventually kills the fungus. This milk spray should be used after every ten days when there is bright sunlight to make sure that the reaction of this antiseptic formation takes place.
Parts of marijuana plants that have already succumbed to the powdery mildew, should be removed in a proper and safe way by using a polyethylene bag and it should be disposed of. After pruning of affected leaves, the stems of those leaves should be treated with antifungal agents.
Other than the above mentioned preventive ways, some other oil sprays such as cinnamon, garlic, coriander, clove, jojoba and cottonseed oil in particular can be used as well. Commercial products like Mold Control work best to prevent marijuana plants from powdery mildew.