Question: yellowed sundavilla
The leaves are turning yellow and I see that the plant is stripping. What should I do? It is exposed to the sun as another of the same species, which is growing thriving.
Answer: yellowed sundavilla
the Sundaville they are particular hybrid plants, very similar to mandeville, which however can survive without problems even in full sun, while the cousins love the half shade and the warm sun of the spring and summer afternoons would kill them quickly. Since you have two plants, placed close together, I don't think it may be a problem related to the position, rather it could be something related to how the plants are grown. Even if two plants are identical, the conditions in the cultivation pot are not necessarily the same: for example, it could already be two pots of different sizes at the start. In addition to this, I don't think you water your plants by accurately measuring the water or fertilizer you supply to each individual plant. Typically, the problem that most often occurs with Sundaville and with mandeville in general it is linked to watering: they do not like stagnant water, and although they are watered regularly, especially when hot, they tend to ruin quickly if even for a few days we leave the ground very wet with water. The high humidity conditions of the soil rapidly favor the development of fungal parasites, which spread through the roots, and cause the leaves to turn yellow rapidly. If you notice that the soil of your dipladenia remains moist for a long time, try to water it a little less; it may be that it receives a little less sun than its neighbor, or perhaps it has a vase of different sizes, or filled with a soil of different quality, which is therefore less draining. In addition to letting the soil dry, to prevent the disease from spreading, it would be advisable to spray the plant with systemic fungicide, which will be absorbed by the plant and will enter the circulation, eradicating the fungi. If, on the other hand, your plant is not always in damp soil, it could be some terrestrial insect: they are insects (usually beetles) that produce their eggs near the stem of the plants; the larvae that come out of it sink into the ground and eat the roots of our beloved plants; as adults, when it comes to oziorrinchi, they come out of the ground and gnaw the leaves. To kill any insects, spread insecticide bait on the ground against soil insects. Also in this case, the use of a systemic insecticide, to be sprayed on the leaves, can help.