Neem oil can enhance the growth and development of barley and help prevent certain pests and diseases. The use of neem oil on barley depends on the specific crop needs and can vary by region and growing conditions.

In general, the recommended dosage for applying neem oil on barley is 1-2 liters per hectare. However, this can vary based on the oil concentration, the level of infestation, and other growth conditions. It's advisable to consult with a local expert or agricultural technician to determine the best dosage for specific growing conditions. Neem oil can be beneficial for controlling pests such as grasshoppers, weeds, and mites that can attack barley. It can also assist in managing diseases like rust, net blotch, and gray leaf spot. However, it's important to note that neem oil cannot be used as a substitute for good agricultural practices, such as proper fertilization, irrigation, and crop rotation.

Neem oil can be used to treat various barley diseases, including: • Rust – Neem oil can help control rust in barley. Rust is a fungal disease that causes yellow spots on leaves and stems, leading to yield loss. • Downy Mildew – Downy mildew is a bacterial disease that causes yellow-brown spots on barley leaves, which then spread to stems and spikes. • Fusarium – Fusarium is a fungal disease that causes root and stem rot in barley. Neem oil can help control Fusarium wilt. The dosage of neem oil on barley depends on the type of product used and the growing conditions. Generally, it's recommended to dilute neem oil with water and spray the plant in its early growth stages. Manufacturers usually provide dosage instructions on the product label, so it's recommended to carefully review the instructions and follow the recommended dosages. After flooding, neem oil can be useful to aid plant recovery and protect against potential issues such as insects and fungal infections. Here are some ways you can use neem oil in a barley field after flooding: Insect Protection: Neem oil possesses natural insecticidal properties that can help control pests that may attack insects like aphids or grain aphids. Prepare a solution of neem oil and water and spray the plants to shield them from insects. Prevention of Fungal Infections: Floods can create favorable conditions for the development of fungi that cause diseases like powdery mildew or barley leaf stripe. Neem oil has antifungal properties that can reduce the risk of fungal infections. Prepare a solution of neem oil and water and apply it to the plants to decrease the likelihood of fungal diseases. Promotion of Plant Growth: Neem oil contains nutrients that can encourage plant recovery and growth after flooding. Apply diluted neem oil to the roots and leaves of barley to support their recovery and growth.