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Oleanders are Dying in San Diego

A bacterium commonly identified with grape vines (Xylella fastidiosa) 
is the suspected cause of “oleander leaf scorch,” which is resulting in the 
slow deaths of thousands of oleanders in San Diego County. Likely
 vectored by the glassy-winged
 sharpshooter (Homalodisca vitripennis), a recent San Diego invader, the disease is fatal with no 
known remedy.

Oleander leaf scorch was first identified in Palm Springs around 1992
 and then moved into Riverside, L.A., and Orange Counties. The first signs 
of infection are seen as an off-color shading and wilting of leaves, 
which eventually turn brown. It appears as if the plant needs 
water, but unfortunately this will not help. It may take some time for the entire plant to show signs of infection, 
but within one to two years the plant will be dead. Cutting of infected limbs 
may slow or prevent spread to the rest of the plant, but complete infection is unavoidable.

Oleanders are found extensively in the median of freeways and backyards of California, and this will likely result in massive losses and eventual 
replacement at great cost. Oleanders are a hardy, dense shrub that can 
grow to heights of 25 feet and require little water or maintenance. 
Caltrans has planted approximately 25 million in Southern California.

 Of particular concern is the spreading of Xylella fastidiosa to other species, such as almonds, alfalfa, plums, and olive trees.

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A bacterium commonly identified with grape vines (Xylella fastidiosa) 
is the suspected cause of “oleander leaf scorch,” which is resulting in the 
slow deaths of thousands of oleanders in San Diego County. Likely
 vectored by the glassy-winged
 sharpshooter (Homalodisca vitripennis), a recent San Diego invader, the disease is fatal with no 
known remedy.

Oleander leaf scorch was first identified in Palm Springs around 1992
 and then moved into Riverside, L.A., and Orange Counties. The first signs 
of infection are seen as an off-color shading and wilting of leaves, 
which eventually turn brown. It appears as if the plant needs 
water, but unfortunately this will not help. It may take some time for the entire plant to show signs of infection, 
but within one to two years the plant will be dead. Cutting of infected limbs 
may slow or prevent spread to the rest of the plant, but complete infection is unavoidable.

Oleanders are found extensively in the median of freeways and backyards of California, and this will likely result in massive losses and eventual 
replacement at great cost. Oleanders are a hardy, dense shrub that can 
grow to heights of 25 feet and require little water or maintenance. 
Caltrans has planted approximately 25 million in Southern California.

 Of particular concern is the spreading of Xylella fastidiosa to other species, such as almonds, alfalfa, plums, and olive trees.

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4S Ranch Allied Gardens Alpine Baja Balboa Park Bankers Hill Barrio Logan Bay Ho Bay Park Black Mountain Ranch Blossom Valley Bonita Bonsall Borrego Springs Boulevard Campo Cardiff-by-the-Sea Carlsbad Carmel Mountain Carmel Valley Chollas View Chula Vista City College City Heights Clairemont College Area Coronado CSU San Marcos Cuyamaca College Del Cerro Del Mar Descanso Downtown San Diego Eastlake East Village El Cajon Emerald Hills Encanto Encinitas Escondido Fallbrook Fletcher Hills Golden Hill Grant Hill Grantville Grossmont College Guatay Harbor Island Hillcrest Imperial Beach Imperial Valley Jacumba Jamacha-Lomita Jamul Julian Kearny Mesa Kensington La Jolla Lakeside La Mesa Lemon Grove Leucadia Liberty Station Lincoln Acres Lincoln Park Linda Vista Little Italy Logan Heights Mesa College Midway District MiraCosta College Miramar Miramar College Mira Mesa Mission Beach Mission Hills Mission Valley Mountain View Mount Hope Mount Laguna National City Nestor Normal Heights North Park Oak Park Ocean Beach Oceanside Old Town Otay Mesa Pacific Beach Pala Palomar College Palomar Mountain Paradise Hills Pauma Valley Pine Valley Point Loma Point Loma Nazarene Potrero Poway Rainbow Ramona Rancho Bernardo Rancho Penasquitos Rancho San Diego Rancho Santa Fe Rolando San Carlos San Marcos San Onofre Santa Ysabel Santee San Ysidro Scripps Ranch SDSU Serra Mesa Shelltown Shelter Island Sherman Heights Skyline Solana Beach Sorrento Valley Southcrest South Park Southwestern College Spring Valley Stockton Talmadge Temecula Tierrasanta Tijuana UCSD University City University Heights USD Valencia Park Valley Center Vista Warner Springs
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