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Pests & Diseases
Home page of the pest, disease and weed department.
Every week something is attacking your plants. Check them out and be prepared to deal with the situation.
Identify the weeds giving you trouble and learn how to deal with them.
Simple search facility to help track down whatever is bugging you.
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Name search.
Use the search box on the left if you know the name of the pest you are looking for. The first result will load into the panel below and any other matches are listed in the right-hand panel. Only common names loaded at present.
Symptom search.
Result will be displayed below. Please scroll down to view.
If you have a sick plant with no obvious cause present, use the search box on the right entering one or two words describing the problem. Simple phrases like 'leaves eaten' or single keywords like 'yellow' work best. As with the name search, matches are listed in the right column and displayed in the panel below.
Search Results.
1 results found.
Black aphid
- Pest type - Insect
- Infects - Foliage,
- Host plants- Dahlia, Pea, Bean, Other,
- Symptoms- Masses of black flies on leaves and shoot tips:
Aphids are small sap-sucking insects that can build up into large colonies in a very short space of time. There are many different varieties that the gardener tends to identify by their colour. Black aphis tend to be most prolific during the spring and early summer months, but local populations can flare up at most times of the growing season.
Plants most affected by these aphids are beans, Dahlia, Hydrangea and sometimes ornamental plants such as Acer.
If left alone, nature usually evens up the balance as these insects have many predators. Spraying with insecticide will get a bad infestation under control, but this can also kill the beneficial insects.
As these aphids are often placed on your plants by ants, iinfestations can flare up without any warning.