Pistachio

Monitor for pests or their damage: Harvest

ON THIS PAGE:
Diseases
  • Alternaria late bight
  • Botryosphaera panicle and shoot blight
    
Invertebrates
  • Cotton aphid
Click on photos to enlarge. Names link to more information on identification and management.
Diseases
Alternaria leaf blight lesions on pistachio leaves.

Alternaria late blight damage

Identification tip: Black angular or circular lesions develop on leaves of both male and female trees infected with Alternaria.

Symptoms on ripe fruit.

Alternaria late blight damage

Identification tip: Dark lesions develop on ripening fruit and leaves infected with Alternaria.

Alternaria leaf blight lesions on the surface of a pistachio fruit.

Alternaria late blight damage

Identification tip: Characteristic red "halos" surround dark lesions on fruit caused by Alternaria.

Blighted shoots, leaves and fruit clusters are discolored brown. Panicles are blighted when temperatures increase in late spring and summer (May - July).

Botryosphaeria panicle and shoot blight damage

Identification tip: Leaves, nuts, and stems turn brown on shoots infected with Botryosphaeria shoot blight.

Large brown Botryosphaeria lesions on older pistachio leaves.

Botryosphaeria panicle and shoot blight damage

Identification tip:  Large, dark brown lesions with wide yellow margins on several old leaves.

Pistachio fruit infected by Botryosphaeria turn brown.

Botryosphaeria panicle and shoot blight damage

Identification tip: Pistachio fruit infected by Botryosphaeria turn brown.

Invertebrates
Adult cotton aphid, Aphis gossypii.

Cotton aphid

Identification tip: Cotton aphid is highly variable in size and color. Adults may be winged or wingless. The wingless form ranges from yellow to green to nearly black. Nymphs that develop into winged adults bear protuberances on their bodies and may be covered with a coat of dusty-appearing whitish wax.

   

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