In gardening, when we see that the color of the leaves of the plants changes to brown we identify this as an indication of the need for water and we water them. Do we do well?
Not always. Today we will see how to identify and treat the yellowing of conifers.
Phytophthora is one of the most common mushrooms in hedges, conifers, and meadows. It usually occurs when two conditions arise: excessive watering and high temperatures. The fact that the plant is weak, poorly fed or in very compact soil only makes the problem worse.
The symptoms are usually the drying of the branches which progresses progressively, starting from the base and gradually rising. Yellowish spots appear in the lawn, which ends up drying up and widening with time.
In fact, this mushroom starts by attacking the roots that absorb water and nutrients from the soil. Despite watering, they cannot feed the plant and, for this reason, the foliage begins to turn yellow. In turn, we identify the symptom as a lack of water and, by continuing to water, we further aggravate the problem.
How to prevent the yellowing of conifers?
- If you haven’t planted the hedge yet, choose a location with well-drained soil to avoid water stagnation. If the soil is very clayey, seriously consider relieving it by adding soil or sand.
- Keep in mind that those plants, which are now small, will grow in the future. Transplant them at a sufficient distance so that as they begin to develop, the roots have enough room to grow. We usually ignore what’s going on underground, but that doesn’t mean it’s not important. If the plants are too close, their roots will compete.
- Remember that the ground must be ventilated. Water filtration will be better if you hoe regularly, preventing the earth from compacting and squeezing.
- Fertilize your plants. Don’t forget that nutrients are what help them grow and stay healthy. Choose a coniferous fertilizer and follow the dosage indicated by the manufacturer.
- Apply the preventive treatment with a specific fungicide.
How to treat the yellowing of your hedge of conifers?
It is important to specify from the beginning that the yellowed parts cannot be recovered. However, what we can do now is to curb the process, using an appropriate fungicide, applied according to the manufacturer’s doses.
It is not a different product from the one we use as prevention, it is the same, however, the dosage to be used changes according to the use, preventive or curative.
We can apply it in two ways: diluted in irrigation water or sprayed with a shoulder sprayer.
Check your watering from now on and avoid stagnant water. If you have installed drip irrigation, check the flow of water they receive and, if necessary, change the drippers or sprinklers to decrease the quantity.
Yellowing or spots on the lawn
As said at the beginning, the Phytophthora can also appear in the meadows. To treat it, we apply the fungicide with the sprayer, making sure that the nozzle is close to the ground. In this way, we will better control the area in which to apply the product.
It will not hurt to apply the preventive dose in the areas adjacent to the spots, in order to avoid the spread of the fungus.
Be constant in applying the treatment during the warmer months. Change the schedule of irrigation and cutting to avoid the central hours of the day.
Phytophthora or lack of magnesium?
Maybe your conifers don’t suffer from Phytophthora but from lack of magnesium. It is not possible to confuse them because the symptoms appear differently.
Pay attention to where the problem starts. If it is in the leaves and starts from the external ones towards those close to the trunk, and from the top to the base, it is a lack of magnesium.
Fitoftora always appears first in the leaves closest to the trunk and spreads outwards, from the base to the top.
It is possible to apply a specific fertilizer to rebalance this lack, which however in no case should replace the regular fertilizer of conifers. Magnesium is one of the many nutrients they need to grow and stay healthy, but it’s not the only one. For this, we must use them in a complementary way.