Control of Diplodia Gummosis in Citrus

Diplodia Kering
Diplodia Kering
Gejala diplodia basah
Diplodia Basah

Diplodia gummosis is one of the major diseases in citrus. Diplodia gummosis disease can occur if there is a pathogen that attacks Botryodiplodia theobromae Pat. and then attack vulnerable plants which grow in a suitable environment for pathogens and with less maintenance.

Diplodia gummosis disease attack rate can be used as a standard of the level of maintenance that has been done; more intensive maintenance can reduce the level of disease. Environmental conditions that facilitate the attack of pathogens including drought, wounding, high difference in day and night temperatures, and less optimum maintenance. This disease is known as diplodia gummosis because one of the symptoms is gumming on the affected stem.

Diplodia gummosis disease can be seen easily when plants are already reacting against pathogen attack by secreting gum as a defense substance. There are two types of diplodia gummosis, namely wet and dry. In wet diplodia gummosis, affected trunk, branches or twigs secrete a golden yellow gum and at the advanced stage, tree bark peels or flakes off. In dry diplodia gummosis, affected bark or branches will dry up without secreting gum, so the symptoms are more difficult to observe. In the bark cracks, there is black or white fungus spore. The attack on the main trunk would be more dangerous than in branches or twigs. Circular attack on a branch will make parts above the affected branch dry up and die.

Control

  • Keep the garden clean by pruning dry twigs and affected branches, and burning or burying it.
  • Maintain farm tools; wash knife, pruning shears and other tools and dab it with cotton soaked in 70% alcohol or 0.5% Clorox before and after use.
  • Smear trunks and branches with Bubur California or fungicide with active ingredient of Cu. Smearing is done at the beginning and end of rainy season.

How to Make Bubur California

Materials:

  • 1 part of sulfur powder
  • 2 part of lime
  • 10 part of water
  • 1 part of detergents

Procedure:

  • Bring water to a boil.
  • Add sulfur powder and continue stirring to a boil.
  • Add cold water to lime until dissolved and settled, and then discharge the clear water part from the sediment.
  • Add lime sediment to the boiling solution of sulfur gradually, stir constantly and heat to a boil.
  • The ready-to-use solution is reddish yellow in color.

Application Method:

  • Clean trunk and branches before smearing with a plastic/fibers brush.
  • Stir Bubur California solution then smear on the trunk and branches.

Smearing is carried out at the beginning and end of rainy season. (Dr. Ir Anang Triwiratno, MP/tr: Tyas)

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