Moths have irregular silver gray and black patterns on the forewings and legs and a small, snoutlike projection formed by a pair of palps in front of the head. Females begin laying multiple eggs on mummy nuts or new crop nuts two nights after emergence.
Opaque white when first laid. After about a day they turn pink, then reddish orange and black-head prior to hatch.
Newly hatched larvae are reddish orange, varying from milky white to pink upon maturing, with a pair of downward crescent-shaped marks on the second segment behind the head.
Almond, pistachio, walnut, figs, and other mature or dried fruits.
Almonds and Pistachios
- Worms do not damage sound nuts until hulls begin to split.
- Often multiple larvae consume most of nutmeat, producing large quantities of webbing and frass.
- Damage can lead to fungal infections resulting in mycotoxin contamination.
- Later maturing varieties are more susceptible.
- Worms do not damage sound nuts until husks begin to split.
- Will infest nuts previously damaged by codling moth or blight.
- Nuts infested solely by navel orangeworm show no external symptoms.
- Heavily infested nuts have an oily appearance on shells.
- Overwinters as active larva in mummy nuts in trees or on ground; usually does not enter diapause.
- Three to four generations per year depending on location and weather conditions.
- Emerges in late March to early April, June through July, and August through September.