Life cycle Crambus

1 life cycle

1.1 egg
1.2 larva
1.3 pupa
1.4 imago

life cycle

crambus patella mating

sod webworms have bivoltine life cycle 4 stages: egg, larva, pupa , imago (adult). overwinter larvae in final or penultimate instar in thatch or soil. coming of warmer weather, larvae pupate, , moths appear in late spring or summer. first generation of eggs laid in june, larvae appearing in june , lasting until july. adult moths appear july until august. under favorable conditions, second generation occur, adult stage laying eggs in october.

egg

the eggs of crambus species dry , nonadhesive, oval elliptical shape. eggs of species white creamy white when first laid, later turn bright orange or red. size of eggs varies between species, ranges 0.3 mm 0.6 mm.

larva

the color of larvae varies greenish beige, brown, or gray, larvae having dark, circular spots extend on entire body. first instar third instar, head capsule appear black, later instars have light brown head capsule various black sculpturation. @ first instar, head capsule 0.19–0.23 mm wide, growing 1.23–2.21 mm last instar. length of whole larvae 9–13 mm (0.4–0.5 in) @ first instar , 24–28 mm (0.9–1.1 in) @ last instar.

crambus larvae, known sod webworms , feed on grasses. in turfgrass species, primary host plants cool-season grasses, fewer records on warm-season grasses. species feed on maize, wheat, rye, oats, timothy-grass, , other grasses in pastures, , meadows, damage occurring in areas permanent sod. damage caused more pronounced during times of drought.

pupa

the pupa develops in silken cocoon attached soil particles, plant debris , fecal pellets. cocoon resembles small lump of earth, while pupa pale yellow @ first, darkening mahogany brown. pupae 8–10 mm (0.3–0.4 in) long 2.5 mm (0.1 in) wide.

imago

the adult moth whitish or light gray tan. many species have patterns of colors, including silver, gold, yellow, brown , black. moths approximately 12 mm (0.5 in) long, wingspans of 20–25 mm (0.8–1.0 in). other snout moths, have long labial palpi extend in front of heads, , fold wings underneath bodies, making them slender , harder see while resting on plants.