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  • Four-Spot Sap Beetle - (Glischrochilus quadrisignatus)

    Four-Spot Sap Beetle - (Glischrochilus quadrisignatus)

    The varied diet of the Four-Spot Sap Beetle makes them both friend and foe of the backyard gardener.

    Picture of Four-Spot Sap Beetle
    Staff Writer (5/21/2015): Four-Spot Sap Beetles feed on the larvae of tree-boring beetles. This makes them somewhat of an aborist's ally in maintaining tree health. They can become a nuisance, however, if they catch the scent of spoiling vegetation in the garden. This species of beetle will take advantage of lazy or overwhelmed gardeners. If fruits and vegetables are left on the vine to rot, or fall victim to a disease and begin to spoil, they release volatile chemicals into the air and the Four-Spot Sap Beetle will descend on the dying fruit/vegetable to feed on the residues. When one Four-Spot Sap Beetle begins to feed on an overripe garden, many others quickly join. This can lead to an infestation. Though they do not attack healthy produce, their large numbers can quickly get out of control and make them a difficult pest to eliminate. Since they do not feed on healthy, growing fruits and vegetables, spraying plants as they grow does not prevent the beetle from coming. Only good garden maintenance does that. Removing diseased, spoiled and rotting produce at regular intervals effectively prevents the beetle from finding a garden.

    Adult females will lay eggs on decaying plant matter after they emerge from overwintering. The eggs hatch sometime in June or July and the larvae feed on whatever plant material is near them until they pupate. Once they become adults, they seek out food sources. Vegetation damaged earlier in the season by other types of insects, like beetle or moth larvae, allow the Four-Spot Sap Beetle to immediately begin feeding at the areas of the existing wounds. They are secondary invaders of many types of important agricultural crops like corn and strawberries. Large numbers of them have been known to spread a fungal infection to the crops which further reduces a healthy harvest.

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    Details of the:
    Four-Spot Sap Beetle

    Category: Beetle
    Common name: Four-Spot Sap Beetle
    Scientific Name: Glischrochilus quadrisignatus
    Other Names: Picnic Beetle

      Kingdom: Animalia
       Phylum: Arthropoda
        Class: Insecta
         Order: Coleoptera
          Family: Nitidulidae
           Genus: Glischrochilus
            Species: quadrisignatus

    Size (Adult, Length): 6mm to 11mm (0.24in to 0.43in)

    Identifying Colors: black, red

    Additional Descriptors: spots, round

    North American Reach (Though Not Limited To*): Alabama; Alaska; Arizona; Arkansas; California; Colorado; Connecticut; Delaware; Florida; Georgia; Hawaii; Idaho; Illinois; Indiana; Iowa; Kansas; Kentucky; Louisiana; Maine; Maryland; Massachusetts; Michigan; Minnesota; Mississippi; Missouri; Montana; Nebraska; Nevada; New Hampshire; New Jersey; New Mexico; New York; North Carolina; North Dakota; Ohio; Oklahoma; Oregon; Pennsylvania; Rhode Island; South Carolina; South Dakota; Tennessee; Texas; Utah; Vermont; Virginia; Washington; West Virginia; Wisconsin; Wyoming; Alberta; British Columbia; Manitoba; New Brunswick; Newfoundland and Labrador; Nova Scotia; Ontario; Prince Edward Island; Quebec; Saskatchewan; Mexico

    * Keep in mind that an insect's reach is not limited by lines on a map and therefore may appear in areas/regions/states beyond those listed above.

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