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In 2001, an unusual rapid decline of ten 20-year-old Aleppo pines (Pinus halepensis) was observed in the parking lot of the Legoland amusement park (33°7’34.2”N, 117°18’41.4”W) in San Diego Co., California. Crowns of affected trees were at varying stages of chlorosis, ranging from pale green to yellow (Fig. 1). Inspection of the aerial parts of symptomatic trees failed to detect any signs of a putative pathogen. Although no external symptoms were observed, upon removal of the bark in the primary woody roots, we identified diffuse black elongated lesions and abundant internal resinosis (Fig. 2). Lesions could be followed along the roots for at least 50 cm on average from the root collar and well into the underground portion of primary roots. Lesions were present around most of the circumference of the root collar of chlorotic trees, suggesting the above-ground symptoms were the result of girdling action by a pathogen. Trees displaying symptoms were in different parts of the large (>200,000 m²) parking lot.

First Report of Fusarium circinatum, Causal Agent of Pitch Canker Disease, from the Roots of Mature Aleppo Pines in California