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Curt Laub

Title Summary Date ID Author(s)
Asiatic Garden Beetle in Field Corn

Order: Coleoptera

Family: Scarabaeidae

Species: Maladera castanea (Arrow)

Size: The adult beetle is 5/16 to 7/16 of an inch long (slightly smaller than a Japanese beetle adult). A fully developed grub (third instar) measures about 3/4 inch long

Color: The adult is chestnut brown or reddish brown in color and faintly iridescent (Fig. 1). The grub (immature stage) is off white except for a distinct head capsule and three pairs of true legs that vary from in color from orange to dark brown.

Description: The beetle abdomen is covered by a pair of hardened forewings, or elytra, which are not used in flight. Instead, their main purpose is to protect the hind wings, which are folded up under the elytra when the insect is not in flight. The grub has a distinct head capsule and three pairs of true legs and will fold into a 'C' shape when disturbed (Fig. 2). It is very easy to differentiate an Asiatic garden beetle grub from other annual white grub species with the aid of a 10x power hand lens. The grub has a single transverse row of spines on the underside of the last abdominal segment, or raster, and a 'Y' shaped anal slit (Fig. 3).

May 1, 2009 444-108
Bluegrass Billbug Pest Management in Orchardgrass

The bluegrass billbug, Sphenophorus parvulus, is a weevil native to Virginia. Weevils belong to the family Curculionidae, which is contained within the order for beetles, Coleoptera. Like most weevils, the bluegrass billbug has a relatively narrow range of host plants, feeding on a handful of cool-season grass species.

Jul 1, 2010 444-040
Compact Soil Sampling Strategy for White Grubs

Annual white grubs (WG) are early-season pests attacking corn seeds and seedlings (Figure 1). Heavy WG infestations can cause stand and yield losses of up to 20%. Because grubs occur in the soil, their presence in fields and subsequent damage to corn may go unnoticed until too late. Also, 30% overwintering mortality in WG densities is typical in VA. Insecticidal seed treatments such as clothianidin (PonchoTM) and thiamethoxam (CruiserTM) are the tools of choice for controlling soil insect pests. Growers typically must decide whether to purchase insecticide-treated seed well in advance of spring planting.

Jun 30, 2011 2802-7027
Hunting Billbug Pest Management in Orchardgrass Jul 1, 2010 444-041
Japanese Beetle Pest Management in Primocane-Bearing Raspberries Sep 15, 2009 2909-1411
Japanese Beetle in Field Corn

Scientific Name: Coleoptera: Scarabaeidae Popillia japonica Newman

Size: Adult is 1/3 to 1/2 inch long; the fully developed grub or larva is 1/2 to 1 inch long.

Color: The adult is shiny metallic green with copperbrown wing covers and is characterized by the presence of five tufts of white hairs which protrude from under the wing covers along each side of the abdomen, with two additional tufts of white hairs on the tip of the abdomen (Fig. 1); the grub has a distinct head capsule that is dark brown to orange in color with the rest of the body an off-white or grayish color due to the presence of soil or fecal matter in the hindgut (Fig. 2).

May 1, 2009 444-106
Slugs in Field Corn

Scientific Names: Deroceras reticulatum (gray garden slug) (Fig. 1), Deroceras laeve (marsh slug) (Fig. 2), Arion subfuscus (dusky slug) (Fig. 3)

Size: Mature slugs vary in size from 1/2 inch to several inches in length; however, the typical size range of slugs found in cornfields is about 1/2 to 1 1/4 inches.

Color: Mature slugs are gray to brownish-gray, depending on the species. Immature slugs resemble adults in color (Fig. 4).

May 1, 2009 444-109
Sugarcane beetle in corn Jun 28, 2012 ENTO-13NP
Using Pitfall Traps to Monitor Insect Activity

Pitfall traps are excellent tools for detecting first activity and monitoring the season-long activity of walking and crawling soil and litter arthropods, especially those that are active at night. Pitfall traps can be used in sampling programs for row crops, orchards, turf, pastures, woodlands, and landscapes.

May 1, 2009 444-416