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Indian meal moth - Plodia interpunctella

Length
7-9 mm

Color
First third of forewings are pale gray. Remainders are reddish-brown.

Larva
Yellowish white, reddish or greenish depending on diet, with brown head.

Life cycle
25-135 days.

Habits
Attacks grain fruits, coffee beans, dried fruits, cornmeal, chocolate, candies, powdered milk, biscuits, bird seed, etc. Adults cause no damage. Larvae are surface feeders. Adults are strong flyers.

Biology
Female lays 100-400 eggs. Upon hatching the larva establishes itself in a crevice of food material.

 

Cigarette beetle - Lasioderma serricorne

Length
2-3 mm

Color
Light brown

Larva
White with many long hairs. C shaped.

Life cycle
25 – 30 days at 30-35 C. Unlikely to develop below 17C. Adults live between 14 and 40 days.

Habits
Attacks paprika, beans, biscuits, cigars, cocoa beans, dried carrots, dried cabbage, dried flowers, flour, ginger, rice, yeast, pepper, herbs, spices, seeds, books, etc. Adults are strong flyers.

Biology
Female lays 30-42 eggs in and about food material.

 

Saw-toothed grain beetle - Oryzaephilus surinamensis

Length
2.5 – 3mm with 6 saw-like teeth on each side of the prothorax.

Color
Brown

Larva
Mature larva yellowish to white.

Life cycle
30-50 days at 35C, 3-4 months at 20C. Adults live 6-10 months. May live longer than 3 years.

Habits
Attacks cereals, bread, macaroni, dried fruits, nuts, sugar, chocolate, dried meats, candy bars, drugs, tobacco, etc. It does not attack sound kernels. Its flat body form permits access through very small cracks and imperfectly sealed packages.

Biology
Female lays 45-285 eggs in crevices in the food material.

Rice Weevil - Sitophilus granarius

Length
2-3 mm 

Color
Dull reddish brown

Larva
Usually hidden within grain and other seeds where it pupates. Legless. Creamy white with brownish black head.

Life cycle
About 98 days at 18C. Will not develop below 16C. 32 days in summer. The optimum conditions are 27-30C, 75-90% humidity and grain of 13.5 – 17.6 % moisture content. Adults live for several months to one year.

Habits
More often found in wheat than in rice. Attack corn, beans, nuts, rye, buckwheat, grapes and others. Can fly at 30C. 

Biology
Female lays 300-400 eggs into the kernel of grain.