NAVEL ORANGEWORM (NOW) Amyelois transitella

Description:

Adults:
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.

Eggs:
Opaque white when first laid. After about a day they turn pink, then reddish orange and black-head prior to hatch.

Larvae:
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.

Hosts:
Almond, pistachio, walnut, figs, and other mature or dried fruits.

Damage:
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.

Walnuts

  • 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.

Phenology:

  • 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.
Navel Orangeworm

NAVEL ORANGEWORM (NOW) Amyelois transitella

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