Pistachio

Alternaria late blight damage

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

Alternaria late blight damage

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

Alternaria late blight damage

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

Botryosphaeria panicle and shoot blight damage

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

Botryosphaeria panicle and shoot blight damage

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

Botryosphaeria panicle and shoot blight damage

Identification tip: Pistachio fruit infected by Botryosphaeria turn brown.

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.