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The Vine Mealybug is a serious grape vine pest that can cause significant damage to grapevines. These bugs damage grapevines by sucking juices from the plant, which can lead to stunted growth and decreased crop yield. They’re easy to identify because they leave behind white mealy “honeydew” on leaves and fruit clusters that look like cotton candy. Grape growers should be aware of this pest so they can take appropriate steps in controlling its population within their vineyard.

Here we’ll provide information about Vine Mealybug identification, life cycle, and Mealybug control and management strategies for grape growers.

How To Identify Vine Mealybugs

Vine mealybugs are small, round insects that feed on the sap of grapevines. These grape vine pests can look very similar to grape leafhoppers, which also feed on the sap of grapevines. Vine mealybugs grow up to approximately 1/8 inch in length and are soft, flat, oval, distinctly segmented, and have a color that ranges from light brownish gray or pinkish to black. They’re most often found on the underside of grape leaves but may also be seen within grape clusters and grapes themselves.

They can also be identified by their long waxy coats and antennae. They lay their eggs in white cottony masses on grape leaves that support sooty mold colonies. Vine Mealybugs also produce chemicals that make it difficult for plants to take in water or nutrients normally from rainwater. Learning how to identify grape vine pests is the first step in identifying and controlling them so as to avoid grape yield problems.

Vine Mealybug Life Cycle

The Vine Mealybug can be found from coast to coast in North America and as far south as Central America. The Vine Mealybug is most active on vines during the hot summer months of July through late October. A female starts a colony by making an egg sac near her feeding site on the grapevine. She lays a batch of eggs, then feeds off sap until the eggs hatch into crawlers, and she repeats this process again.

The Vine Mealybug spends most of her time in colonies feeding on grapevine sap that has been drawn out by other insects such as Grape Leafhoppers or Grape Berry Moths. The life cycle of these grape vine pests is only one to two months, but the damage they cause can be devastating. Their colonies will grow quickly, and they will feed on the grape vines until they are near death. If proper Mealybug control isn’t done, grape vine plants will eventually die.

How To Control Vine Mealybugs

Vine Mealybugs are a fruit pest that can be difficult to control, so you need to be aware of the best ways to keep them under control. Keep in mind that depending on the region, type of grape, and harvest date, you can apply different types of control measures:

  • Biological Control – This involves using natural enemies such as ladybugs or lacewings to control mealybug populations.
  • Physical Control – This consists of the removal and destruction of all infested shoots, buds, and foliage to control these grape vine pests.
  • Chemical Control – Use insecticides that are labeled for Vine Mealybug pest management on grape plants at an appropriate time during the vineyard’s life cycle.
  • Cultural Control – This involves two aspects: Grapevine pruning and management of the grape plant environment.
  • Organic Control – This is achieved through a systemic insecticide that is applied to the soil in order to control Vine Mealybugs feeding on roots.

While you can take various preventative measures, such as insecticides and row covers, the best time to eliminate a Vine Mealybug infestation is early on. Mealybugs are slow-moving insects that suck sap from plants, so they need high humidity levels to thrive. By targeting their habitat with pesticides, you can reduce their numbers. Other grape vine pest control methods include soil injections or sprays.

These bugs can also be discouraged by planting resistant varieties of vines and maintaining a healthy plant. Vine growers should consult their local county agricultural office for more information on these grapevine pests and the most effective and sustainable control methods to ensure vineyard success.

Monitoring and Treatment

It can be a challenge to control Vine Mealybug populations once they reach damaging levels. Focusing on the early detection and eradication of these grape vine pests is the best way to keep your vines healthy and free of Vine Mealybugs. The key to ensuring the long-term health of your vines is to use integrated pest management (IPM) strategies that include monitoring and treatment, as well as prevention.

When you monitor grapevines, it’s important to look closely at the leaves near the soil line where these pests tend to congregate. Mealybugs can be hard to spot, so you’ll want to look for black excrement near their hiding spots. Grape growers should also monitor vines’ roots and shoots – these are common areas where Vine Mealybug infestations start.

Monitoring your grapevines with a vineyard management program that includes a regular schedule for Grape Mealybug control will help to reduce populations before they become too large. Treatment of grape vine pests can be done using various methods such as pre-planting soil treatments, dormant spray applications, and post-harvest chemical applications. Your control plan will depend on the severity of your infestation as well as which grape varieties are being grown in the vineyard.

Grape growers should consider the timing and frequency of treatment and which chemicals to apply since there are different types available. This is critical to avoid Grape Mealybug resistance and to make them easier to control in the future. 

What The Future Holds For This Invasive Pest In California Grapes


Grape vine pests are a difficult problem for grape growers to manage. These pests have been hampering California’s wine industry since they were first discovered in the state in the mid-1990s. Since then, Grape Mealybugs have been found in the majority of California’s vineyards.

Grape Mealybug control and management is vital in order to ensure the future viability of California’s wine industry so that we can enjoy delicious grapes and wines with our families and friends well into the future.

Learn More with Fruit Growers Supply

If you want to find out more about the Vine Mealybugs, how to control these grape vine pests, and what grape growers should know about planting grapes, contact us to speak with a representative. Fruit Growers Supply is your one-stop-shop for fruit supply needs and equipment.

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