Recognising the signs and symptoms

Just like a good doctor, a horticulturalist needs to able identify the signs and symptoms when examining an ailing plant (our patient in this instance) before the proper remedy can be prescribed.

I think before examining the different signs and symptoms, you really should look at an explanation of what plant pests or diseases are.

Here's one definition for you:

Sounds pretty technical, does it?

Don't worry. It might make more sense when you actually look at some examples of what you could expect to see in damaged plants.

But first it's probably a good idea to look at the meaning of:

• living agents

• non-living agents

• injury

• disease

When you are looking at the various signs and symptoms, take a closer look at how I've grouped them by their cause, that is, by either living or non-living agents. Also notice how I've further divided these agents into a type of problem, for example, whether it's an injury or disease. I did this to help you not only recognise the signs and symptoms, but also to categorise them more easily.

As you can see, pests and diseases leave telltale signs and learning to recognise them is part of the skills of becoming a good practitioner of horticulture.

The next time you are walking around the garden take a little time to stop and examine the plants to see if they are displaying any of the signs and symptoms discussed. Then see if you can make a diagnosis about the cause and problem.

It's important to realise at this stage of your horticultural career that recognising and treating damaged plants is an ongoing learning process. In fact, it involves lots of looking, watching, asking questions and carrying out tasks, all aimed at gaining a better understanding about plants and how to care for them. Like the old saying goes "Rome wasn't built in a day", and it's also true about experience, but the more practice you get. the better you'll become.