We have 2 Dipladenia Sanderi plants in large pots out in full sun. In last couple of weeks, the leaves have started to turn yellow and drop off though the flowers are still quite strong. We can't see any sign of insect infestation and are wondering what could be the most likely cause
21 August 2012 06:43 AM
Sometimes cooler than usual weather can affect Dipladenias. Yellow leaves are produced if it is too cold or water/rain is sporadic. Check the pots to see if the potting mix is holding water and how moist the soil is. Mites may also cause the leaves to yellow. Mites are microscopic and are not easily seen unless you have a magnifying glass or hand lens. Sometimes slight webbing can be seen. If you suspect you have mites spray with Yates Nature's Way Vegie & Herb Spray. Fertilise the Dipladenia now and again later in the season. Yates Dynamic Lifter Soil Improver & Plant Fertiliser and is suitable for Dipladenias.