African white stemborer facts for kids
Quick facts for kids African white stemborer |
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| Scientific classification | |
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Pyralidae
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| Genus: |
Maliarpha
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| Species: |
M. separatella
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| Binomial name | |
| Maliarpha separatella Ragonot, 1888
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The African white stemborer (scientific name: Maliarpha separatella) is a type of moth. It belongs to the Pyralidae family. This moth is a common pest in rice fields around the world. You can find it in many African countries. These include Cameroon, Mali, Réunion, Madagascar, and South Africa. It also lives in Asian countries where rice is grown. Some of these are Myanmar, India, and Sri Lanka. While mostly known for rice, it can also attack sugarcane. It has been seen in China and Papua New Guinea too.
Contents
What Does the African White Stemborer Look Like?
These moths usually have a wingspan of about 20 to 30 millimeters. That's about the size of a large coin. Male moths have a reddish-brown head and body. Their front wings are also reddish-brown. They have a wide, pale stripe along the front edge. The back wings are a yellowish-white color. Female moths are often more reddish overall.
What Do They Eat?
The young moths, called larvae or caterpillars, like to eat different kinds of grasses. This includes important crops like corn (Zea mays). They also feed on Oryza species (which includes rice). Other plants they eat are Andropogon tectorum, Saccharum species (like sugarcane), and Sorghum species.
How Do They Harm Plants?
The caterpillars are the main problem for plants. They bore into the stems and tunnels inside. They eat the inner parts of the plant and drink its sap. If there's a lot of damage, you might see small, round holes in the plant stems. Luckily, this pest rarely causes "deadhearts" (when the central shoot of a plant dies) or "whiteheads" (when rice heads turn white and empty).
How Can We Control Them?
Controlling these pests can be quite simple. Farmers can use a few methods:
- Stubble rotting: This means letting the leftover plant parts (stubble) rot after harvest. This can kill any pests hiding inside.
- Adjusting planting dates: Planting crops at different times can help avoid the peak pest season.
- Adjusting planting density: Changing how close plants are grown can also make it harder for pests to spread.
In some places, like southwest Nigeria, farmers use "trap crops." These are plants grown specifically to attract pests away from the main crop. This method has been very helpful.
Natural and Chemical Controls
Unlike some other rice pests, using natural enemies (biological control) isn't always very effective for the African white stemborer. This is because the caterpillars spend most of their time hidden inside the plant stems. This makes it hard for other insects to find and attack them.
However, recent studies have found some helpful tiny wasps. These wasps are called parasitoids. They can attack the borers. Some of these helpful wasps include Chelonus maudae, Rhacanotus carinafus, Prisfomerus bullis, Prisfomerus caris, and Venturia jordanae.
Using special sprays (chemical control) can also be an effective way to control these pests.
