pest guide 5
![](https://images.echocommunity.org/8004edb8-ee88-4d79-9c99-2588b2af0d31/insect%20pest%20guide%20photo%205.jpg?w=400)
Fungal diseases often appear as spots similar to bacterial spots, but they typically do not look wet and often have distinctive concentric rings (A & B). Fungi can also cause damping off, where stems of newly emerging seedlings and young transplants collapse inward and cause the plant to fall over and die. Some piercing-sucking insects such as aphids, secrete a sugary substance that can encourage the growth of some fungi such as sooty mold on the leaf surface (C), limiting photosynthesis.