Do Tomato Horned Caterpillars Stay on the Plant During Rain?

Tomato horned caterpillars, also known as Manduca quinquemaculata, are a common pest found on tomato plants. They are known to cause significant damage to plants, as they eat foliage and fruits.

During rain, many gardeners wonder if these pests stay on the plant or move to a sheltered area. The truth is that it depends on the intensity and duration of the rain, as well as the size and age of the caterpillar.

Size and Age of Caterpillars

Smaller and younger caterpillars are more likely to stay on the plant during rain. They are not as heavy and are not able to cling onto leaves as tightly as larger caterpillars. Additionally, they are not as experienced in seeking shelter and may not recognize that the rain is a potential danger.

Larger and older caterpillars, on the other hand, are more likely to move to a sheltered area during rain. They are larger and heavier, and their grip on the leaves is stronger. Furthermore, they have more experience and may recognize the signs of rain and seek shelter accordingly.

Intensity and Duration of Rain

The intensity and duration of rain also play a role in whether or not tomato horned caterpillars will stay on the plant. Light rain may not be enough to dislodge the caterpillars from the leaves, especially if they are small or have a good grip on the plant. However, heavy rainfall may result in caterpillars falling off the plant or being washed away. If the rainfall is prolonged, caterpillars may seek shelter to avoid drowning.

What to Do

If you are concerned about tomato horned caterpillars during rain, there are a few things you can do. First, inspect your plants regularly for the presence of caterpillars. By catching them early, you can prevent them from causing significant damage to your plants. Additionally, consider using natural pest control methods, such as introducing predatory insects or companion planting.

If you are experiencing heavy rainfall and want to protect your plants from damage caused by caterpillars, consider using a physical barrier. Covering your plants with a row cover or other material can prevent the caterpillars from reaching the leaves.

Conclusion

Overall, whether or not tomato horned caterpillars stay on the plant during rain depends on several factors. Size, age, intensity, and duration of rain all play a role in the behavior of these pests. Understanding these factors can help gardeners take appropriate measures to protect their plants from damage caused by caterpillars.