Prevention of dry branch and fruit diseases in coffee

Dry branches and dried cherries on coffee often increase after wet rain, weakened trees or dense canopy orchards. Instructions on distinguishing from branch-boring beetles, early identification on fruit-bearing branches and prevention by pruning the canopy, nutrition, cleaning and timely spraying.

Summary: Dry branches and berries on coffee cause direct loss of productive branches. The disease often appears clearly during the rainy season or after periods of tree decline, but the cause is not just fungus. Overly dense canopy, lack of nutrition, overbearing fruit trees and damaged branches all make the disease worse. This article explains how to distinguish between branch borers and seasonal prevention procedures.

Applies to: Robusta Coffee in Dak Lak, Dak Nong, Gia Lai, Lam Dong, Kon Tum.
Duration: Monitor from fruit setting to post-harvest.
Difficulty level: Medium. It is necessary to observe fruit-bearing branches and canopy condition.
Estimated additional costs: 2-5 million VND per hectare per year for pruning, cleaning and spraying when needed.

What are dried branches and dried fruits?

Dry branches and dry fruits are the phenomenon of coffee branches drying out in sections, the fruits on the branches becoming black, flat or falling off. Agents may include pathogenic fungi, but underlying conditions are important:

The plant lacks nutrients after a high-yield crop.
The canopy is dense and humid for a long time during the rainy season.
The branch bears too many fruits.
The branch is damaged by insects, beetles or mechanical damage.
Poor orchard drainage or weak roots.

Therefore, if you only spray fungicides without treating the canopy, nutrients and water, the disease will easily recur.

Recognize symptoms

On the branch

The branches bear fruit that gradually turn yellow and then dry.
Dry starts from the tip of the branch or the middle of the branch.
The bark of the branches turns brown and brittle.
The leaves on the branches are dry but may stick around for a while.

On the fruit

The fruit shrinks, dries black or dark brown.
The kernel is light, flat, and of poor quality.
Fruits can fall or dry on branches.

Distinguished from branch-boring beetle

Sign	Dry branches, dry fruits	Twig boring beetle
Perforated hole	Usually absent	There are small holes and chisel
Dry sample	Dried in branches and fruit clusters	Dry above the beetle site
Increase condition	Damp rain, weakened trees, dense canopy	Dried branches, declining orchard, source of termites
Main processing	Pruning + nutrition + fungus prevention	Cut and destroy branches with weevils

When you see a dry branch, you must check the hole first. If there are termites, treating it like a fungal disease is ineffective.

Severe disease conditions

Prolonged rain, high humidity.
The orchard is planted thickly, the canopy intersects.
Lack of potassium, calcium, micronutrients.
The tree bears thick fruit but recovers poorly after harvest.
Many old branches, not pruned after previous crops.
The orchard has anthracnose, rust or branch-boring beetles.

Dried branches and dried fruits are often the result of many stresses combined, not a single cause.

Seasonal Room

After harvest

Cut off dry branches, diseased branches, and exhausted branches.
Fertilize with decomposed organic matter, balanced fertilizer, add potassium if necessary.
Manage water in the dry season so that plants do not decline for a long time.
Clean dry branches and remaining dried fruits.

If you don't do well after harvesting, the next crop of fruits can easily dry out and dry out the branches.

Before the rainy season

Pruning to let light in.
Cut branches that touch the ground, branches grow into the canopy.
Spray broad-spectrum fungus prevention if the orchard has a history of severe diseases and the weather is about to rain for a long time.
Check for parallel borers.

Fruit growing stage

Fertilize according to the plant's strength, do not let the plant lack potassium.
Watch for fruit-bearing branches that are too thick.
When you see branches starting to turn yellow, immediately check for weevil holes and disease signs.
Cut off seriously diseased branches, do not let them dry and hang in the orchard.

Treatment when the disease appears

Mild level

Cut off dry branches.
Recovery fertilizer if the plant is lacking nutrients.
Increase ventilation.
Follow up in 7-10 days.

Moderate to severe

Cut and destroy diseased branches.
Check for twig borers, aphids, and accompanying rust.
Apply appropriate fungicide according to local recommendations and product labels.
Rotate active ingredient groups if multiple sprays are required.
Do not spray before heavy rain.

If the disease recurs over many years in the same plot, it is necessary to check the soil, roots and nutrition, not just treat the canopy.

Nutrition and water

To reduce dry branches:

Do not let plants lack water for a long time during the dry season.
Organic fertilizer helps soil retain moisture and roots become stronger.
Balance nitrogen, phosphorus, potassium; Do not fertilize with high nitrogen in one direction.
Supplement calcium, magnesium, zinc, boron if lacking.
After a high-yield crop, it is necessary to recover soon.

Healthy branches, hard tissue, and enough reserves will cause branches to dry out less during the rainy season.

Common mistakes

If you see a dry branch, spray it immediately: need to check for weevils, roots, and nutrition first.

Do not cut diseased branches: the source of disease and weevils are still in the orchard.

Canopy too dense: spray does not reach the inside, moisture lasts for a long time.

Nitrogen fertilization helps plants grow faster: branches are soft, diseases are easier to attack if potassium and micronutrients are lacking.

No post-harvest recovery: plants enter the next season with weak strength.

Monitor and record

[ ] Proportion of trees with dry branches.
[ ] Percentage of dry branches with moth holes.
[ ] Disease location: orchard edges, sunken plots, dense canopy plots.
[ ] Rainfall schedule before disease outbreak.
[ ] Amount of manure recovered after harvest.
[ ] Ratio of dry and flat fruits when harvested.

Specify whether the dry branch is due to weevils or not. These two groups handle things differently.