No major effects on plant vigor have been noted from the feeding of the larvae on plant roots. Cultural methods can help reduce plant losses caused by flea beetles. A firm seedbed that is well tilled and adequately fertilized will help plants outgrow beetle damage during the susceptible early season stages. A few flea beetles or scattered shot-holing are not necessarily cause for alarm. However, if flea beetles are numerous on plants and feeding holes are present in most cotyledons, immediate control will likely be required.
Flea beetles are shiny black, jumping beetles about inch long.
Diamondback moth caterpillars attain a length of inch and are light yellowish-green to green. The larvae eat leaves, flowers and green pods and are extremely active when touched. Diseases Mustard is attacked by several diseases. It is not recommended to include mustard in crop rotations containing crops such as sunflower, canola, dry edible bean, crambe or safflower. These crops have similar disease problems so disease infestations can build to economic levels.