Citrus Thrips: A Threat to Citrus Trees
Citrus thrips are tiny insects that can cause significant damage to citrus trees and their fruit. They are considered a major threat to commercial citrus production, but they can also be a problem for home gardeners.
What Are Citrus Thrips?
Citrus thrips are tiny, orange-yellow insects that are only about .6 to .88 millimeters in size. They have an oval-shaped body with six hairy legs and fine hairs covering their entire body. Citrus thrips go through four stages of development, with the second instar being the most damaging to citrus fruit.
How to Identify Citrus Thrips
Citrus thrips can be difficult to spot because of their small size. However, there are a few signs that can help you identify them:
- Tiny orange-yellow insects on the leaves, flowers, or fruit of your citrus tree
- Silvery or whitish trails on the surface of the fruit, which are caused by the thrips feeding on the cells in the rind
- Early scars that turn into rings of damaged tissue on mature fruit
- Marred exterior that makes the fruit appear unpalatable
Damage Caused by Citrus Thrips
Citrus thrips feed on the fruit buds and puncture the cells in the rind, causing scarring and scabs. This damage can make the fruit unmarketable, especially in commercial production where buyers expect perfect-looking fruit. Thrips can also spread to commercial orchards from dooryard trees, so it is important to manage thrips on all citrus trees in an area.
How to Control Citrus Thrips
Non-Chemical Control Methods
- Monitor your trees carefully for signs of citrus thrips infestation.
- Use non-chemical methods such as insecticidal soap or neem oil to control thrips populations.
- Encourage natural enemies such as ladybugs and lacewings, which prey on thrips.
Chemical Control Methods
- Use specific formulas for thrips control. Avoid using broad-spectrum pesticides, as these can kill the natural enemies of citrus thrips.
- Be aware that thrips can develop resistance to chemicals. It is important to rotate different types of chemicals to prevent resistance from developing.
- Follow the instructions on the pesticide label carefully. Do not overuse pesticides, as this can harm beneficial insects and the environment.
Frequently Asked Questions
What is the most damaging stage of citrus thrips?
The second instar of citrus thrips is the most damaging to citrus fruit.
How can I prevent thrips from damaging citrus fruit?
There are a few things you can do to prevent thrips from damaging citrus fruit:
- Keep your trees healthy. Healthy trees are less likely to be infested with thrips.
- Monitor your trees regularly. Check your trees for signs of thrips infestation and take action to control the population if necessary.
- Use non-chemical control methods. Non-chemical control methods are less harmful to the environment and beneficial insects.
What are the best chemicals to use for citrus thrips control?
There are a few different chemicals that can be used to control citrus thrips. Some of the most effective include:
- Pyrethroids
- Organophosphates
- Spinosad
How can I manage thrips on dooryard citrus trees?
Managing thrips on dooryard citrus trees is important to prevent the spread of thrips to commercial orchards. Here are a few tips:
- Monitor your trees regularly. Check your trees for signs of thrips infestation and take action to control the population if necessary.
- Use non-chemical control methods. Non-chemical control methods are less harmful to the environment and beneficial insects.
- Be aware that thrips can develop resistance to chemicals. It is important to rotate different types of chemicals to prevent resistance from developing.
