All you can do is remove and burn any affected plants. Then you either have to dispose of the soil in a dedicated drop-off point for sterilization, or treat it yourself. You can saturate it with boiling water, and then treat it with a strong biological fungicide. INSV tends to be spread by insects, especially flower thrips. There are a few different mold diseases that can affect basil plants, and the two most common are gray mold and downy mildew.
Both will cause your basil plants to turn brown, with fuzzy growth on and under the leaves and leaf stems. Try to water your herbs at soil level to avoid moisture accumulation on and under the leaves. Prune the leaves often so they get plenty of air flow. This will dry out any potential damp pockets, and will also dissuade insects from getting too comfortable. Just make sure to wear gloves when handling these, and wash your clothes and skin thoroughly.
We mentioned earlier that INSV virus is transmitted by thrips. These tiny insects like to nest in soil-level detritus such as fallen leaves. They crawl all over plants, sucking out their juices and leaving silvery trails behind on the leaves. These leaves quickly turn brown and fall off. Aphids also like basil plants, and can devastate your entire herb patch if allowed to run unchecked.
Beneficial insects like ladybugs and earwigs help to kill and eat aphids. Additionally, you can get organic pesticides that target aphids. Basil is extremely sensitive to cold, and the leaves can turn brown if it does not receive enough sun. This herb should not be planted outside until the danger of frost has completely passed.
Basil plants also require full sun to grow, and although they can grow on a windowsill, the part of the plant turned away from the window and not getting direct light can suffer. Basil should be planted in a very sunny but sheltered spot so that it can receive the maximum amount of sunlight without the chill of the wind.
Basil should be well-watered in the middle of a hot summer, but too much water can also cause the roots to rot and the leaves to turn yellow and then brown.
The soil of the plant should remain moist, but not soggy. Basil can become pungent and bitter if not well-watered, but it can drown in too much water. If you face the browning leaves problem for potted basil, make sure the container has a drainage hole and the soil has good drainage facilities. Repotting is the best way to revive the affected potted basil.
But if the root damage entirely, sorry to say, you are lost your basil. You should plant new baby basil. Note: You can also keep basil from wilting by following those steps. And if you protect your plant from wilting, then automatically you can protect your basil leaves from turning brown. Also, never spray water on the basil leaves, it causes the brown spots on basil. Underwatering also shows the same symptoms. I have told that the basil needs 1-inch water per week.
But you should apply more water depending on the weather condition. If the weather is too hot and windy, the soil dries more quickly. So, you must apply water more frequently. Also, you can poke a stick or finger to feel the dryness of the soil. If the soil feels hard, add moisture to the soil. But be careful about water lodging conditions that cause root rot. Root bound occurs for potted basil plants mostly.
You know, healthy roots mean healthy plants. And the roots need space to grow and thrive successfully. Remove the affected basil plant gently from the existing pot.
Loosen the root-soil carefully and repot the plant in a large pot or container. Faulty soil and improper fertilization cause the fresh basil leaves to turn brown.
Highly acidic and highly alkaline soil causes browning and curling of basil leaves. Plus, Too much chemical fertilizer increases the chance of attack the diseases and pests. Basil loves neutral or slightly acidic soil.
These diseases are caused by fungi that can cause the leaves to brown and curl. Damping-off can be treated with fungicide, but there is no cure for fusarium wilt, and infected plants must be destroyed.
Prevention is the best defense against fungal diseases such as fusarium wilt and damping-off. Refrain from overwatering the basil since soggy soil encourages fungus growth and ensure you have the proper spacing between the plants for proper airflow. Spacing depends on the variety of basil, but 12 to 24 inches is generally the recommended space between each plant.
Basil plants are low-maintenance and do not require much care. What little care they require, however, is important to keeping the herb healthy and the foliage supple. Too much water, too little water and lack of sun will turn the basil leaf tips brown and cause them to curl.
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