Pests can become vectors of viruses, fungi, or bacteria. Pests damage the plant by feeding on the sap and leaves. They won’t leave your flowers or fruits. All these can lead to changes in color or wilting. It can even cause death if left untreated. Here are pests to look out for in cucumbers.
APHIDS
Aphids are soft-bodied small insects that suck sap from a plant. You can find these insects on the underside of leaves and stems, where they prefer to feed. These colors differ depending on the species, but the most common ones are yellow or green.
Other colors include brown, pink, red, and black. Common aphid species that infect cucumbers are Myzus persicae (peach aphid) and Aphis gossypii (melon aphid).
- SYMPTOMS – Heavy aphid infestation causes leaves to turn yellow and distorted, and you’ll see the insects on the underside. It looks like yellow or green spots (the aphids’ bodies). Black or brown necrotic spots appear on the surface, and parts of the plant may feel sticky. It is due to the honeydew that aphids secrete.
How to treat and prevent aphid infestation
- If the infestation is not severe, you can simply remove the infected parts. Make sure that you prune out all infected areas.
- Use insecticides if the infestation is severe. Other organic treatments are also available such as the use of neem and canola oil.
- Always check the transplant for any signs of aphid infestation before planting. Make sure they are spaced appropriately.
- Create a shed or garden bed that can prevent the entry of other pests or animals that can be vectors of diseases.
the underside of a leaf infested with Myzus persicae
Image source: Jim Baker – North Carolina State University
the underside of a leaf infested with Aphis gossypii
Image source: Penn State on Flickr
Cucumber beetles are also worth mentioning because they are common pests that plague the plant. However, these do not change the color of the foliage. These beetles feed on fruits and leaves. They also like stems. Symptoms include wilt and damaged foliage. The presence of larvae and adult insects is another thing to look out for.
