The leaf rust is one of the known diseases that can attack horticultural plants. This disease causes damage to certain organs, especially leaves. Leaf rust usually happens to tropical plants like coffee, celery, peanuts, and corns.
Leaf Rust on Celery
Here are some signs that your plants are suffering from leaf rust:
- Yellow specks on the underside of leaf that will then change the entire leaf into dark yellow in color
- The underside of the leaf is dusted by orange-y dust which is a cluster of Hemileia vastatrix fungus
- White specks which then turns into dark brown or even black that dries up the leaf
- Overt leaf abscission on tropical plants
- Leaf Rust Control on Coffee
Varieties of coffee that are often attacked by leaf rust are Arabica and Robusta coffee. However, based on the immune system, Arabica coffee variety is more vulnerable to leaf rust than Robusta. The way to prevent leaf rust on both varieties so far is by spraying fungicides on them.
In East Java, Indonesia, several varieties of coffee like the S795, USDA, and Karika are vulnerable to leaf rust. However, lately, Karika coffee type is even more vulnerable to the attack.
Some fungicides that coffee farmers usually use to take care of leaf rust are systemic fungicides like tramadefon (Bayleton 250 EC) or copper fungicides like copper Sandoz, cobox, cupravit, and vitigran blue.
- Leaf Rust Control on Corn
Especially for corn, the sign of leaf rust can be seen through yellowish white dusting on the underside of the leaf or in between stem segments.
To prevent leaf rust on corn, it’s best to buy seeds that can tolerate and withstand diseases. They’re usually labeled so in your local shops or you can ask the seller directly. If needed, you can use fungicides like copper oxychloride, zineb, fermat, and dithane.
- Leaf Rust Control on Peanut
Peanut plants are often made to be host plants for parasitical fungus that causes leaf rust. You can prevent this by implementing the technical culture system which is making sure you have enough row spacing distance between one peanut plant and another to avoid high air humidity.
Healthy Peanut Plants With Technical Culture System
Control can also be chemically done using fungicides like fermat, zineb, copper oxychloride, and dithane.
- Leaf Rust Control on Celery
The sign of leaf rust on celery is the cluster of fungus that causes leaf rust that’s dusty and yellowish white in color. The type of fungus is the Hemileia vastatrix. This will cause celery leaves to curl.
Prevention can be done by growing celery using hydroponic system. Early, scheduled watering is also good to help prevent leaf rust.