Nut Weevil

Bore holes in tree nuts and lay their eggs inside
Nut Weevil Scientific Classification
Nut Weevil Physical Characteristics
Brown, White, Tan, Cream, Light-Brown
2 years
Nut Weevil Distribition


A serious bug of nut orchards, nut weevils are beetles in the family Curculionidae. These insects lay their eggs within and feed on nuts, which is where they obtain their name. Various species target particular sort of nuts and have actually usual names related to their host nut. They have an obvious nose referred to as a rostrum that can determine virtually as lengthy as the remainder of the body.

5 Nut Weevil Realities

  • A female usages her rostrum to birthed an opening inside nuts to make sure that she can transfer her eggs within.
  • Upon hatching, nut weevil larvae eat the majority of their host nut prior to tunneling right into the ground to start transformation.
  • The rostrum of a female can determine as long as her body, while a male’s rostrum has a tendency to determine a little much shorter.
  • Nut weevil invasions can badly affect nut harvests, with some areas reporting larvae in virtually 90% of all gathered fruit.
  • Nut farmers have actually resorted to numerous bug- control strategies to fight nut weevils, consisting of thermal therapies, radio waves, and awesome fungis.

Nut Weevil Species, Kind, and Scientific Name

About 36 special species share the usual name nut weevil. Every one of these species come from the genus Curculio in truth weevil family Curculionidae. Curculionidae beetles additionally pass the name bark weevils or nose weevils as a result of their classically lengthy rostrums. In some areas, they pass the name seed weevils. Several species additionally have an added usual name related to the kind of nut that acts as their host.

Some remarkable species consist of:

  • Pecan weevil – – Curculio caryae
  • Chestnut weevil – Curculio elephas
  • Nut weevil – Curculio nucum
  • Hazelnut weevil – Curculio obtusus
  • Little chestnut weevil – Curculio sayi
  • Filbert weevil – Curculio uniformis

Appearance: Just How to Recognize Nut Weevils

Nut weevils differ in dimension and appearance relying on the species. That claimed, they share a number of usual features. A lot of these insects action in between 4 and 15 millimeters long, with the bulk averaging from 6 to 9 millimeters long. Grown-up nut weevils usually show up brown or tan, while the larvae appearance luscious white. One of the most distinct function of grown-up nut weevils is their lengthy, nose- like rostrum. Females have a rostrum that determines around as lengthy as their body, while males have a rostrum determining around 2- thirds that dimension. The rostrum has mouthparts at the end that they utilize to eat vegetation. Furthermore, the females utilize their rostrum to pierce with the coverings of young nuts to make sure that they can lay their eggs inside with their ovipositor.

Nut weevil on a plant
One of the most distinct function of grown-up nut weevils is their lengthy, nose- like rostrum. Henrik_L

Environment: Where to Locate Nut Weevils

You can locate nut weevils in orchards, woodlands, and various other woody locations anywhere their host species are located. The majority of are located in The United States and Canada or Europe. In The United States and Canada, they vary in between southerly Canada and north Mexico, while in Europe, you can locate them from southerly Scandinavia to the Mediterranean. The females lay their eggs inside nuts, which work as the residence for the larvae for the very first couple of weeks of their life. Once they’re big sufficient, the larvae after that passage below ground to start the following stage of their life process. They build a cell where they overwinter till the list below year and start the change right into grownups. The grownups after that continue to be inside the cell for another wintertime prior to arising from their below ground resorts and making their method right into the vegetation of their host tree.

Diet: What Do Nut Weevils Eat?

As their name suggests, nut weevils eat various ranges of nuts. They are infamously choosy eaters, with each species targeting a solitary host plant. As an example, chestnut weevils eat chestnuts, pecan weevils eat pecans, and hazelnut weevils eat hazelnuts. When eggs hatch out, the larvae arise and start to eat their host. The larvae will certainly eat the nut till virtually absolutely nothing continues to be, whereupon they will certainly tunnel right into the ground, where they continue to be till they become grownups. At the same time, grown-up nut weevils eat the fallen leaves and young buds of their host plant.

Avoidance: Just How to Remove Nut Weevils

These insects are taken into consideration significant insects as a result of their financial influence on farming plants. In some areas, they can infest as much as 90% of some host plant species. The larvae damages the nuts, creating them to go down from trees and minimize harvest degrees too soon. To get rid of nut weevils, farmers utilize a variety of unique strategies and therapies. Although pesticides such as Sevin are in some cases made use of, chemical administration of nut weevils is intricate and accomplishes much less- than- outstanding outcomes. Success calls for the application of pesticides at simply the correct time, usually throughout breeding or the beginning of egg- laying period. In recent times, some farmers have actually supported using organic bug control representatives. As an example, the nematode Heterorhabditis indica can confirm lethal to larvae, as can the fungi Beauveria bassiana At the same time, various other farmers are try out radio waves or warm therapies to eliminate the eggs or larvae.


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