Unusual decline of tanoak sprouts

Philip M. McDonald; Detlev R. Vogler; Dennis Mayhew

doi:10.2737/PSW-RN-398

Treesearch

Unusual decline of tanoak sprouts

Informally Refereed

Authors:

Philip M. McDonald, Detlev R. Vogler, Dennis Mayhew

Year:

1988

Type:

Research Note

Station:

Pacific Southwest Research Station

DOI:

https://doi.org/10.2737/PSW-RN-398

Source:

Rea. Mote PSW-RN-398. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 4 p

Download (PDF 553 KB)

Download (PDF 553 KB): https://research.fs.usda.gov/download/treesearch/30701.pdf

Abstract

Comparisons between abnormal and normal sprout clumps of tanoak (Lithocarpus densiflorus [Hook. & Am.] Rehd.) in northern California indicated that sprouts in abnormal clumps had about five times the number of sprouts per dump, were three times as wide, and only one-fifth as tall. Stunted and chlorotic sprouts were examined for virus and disease organisms that might be used for biological control of this often weedy species. No pathogens or viruses that could account for the abnormal development were found in field or laboratory. but tests were not exhaustive. Decline could be from physiological events, unidentified pathogens or viruses, or lack of genetic exchange as a consequence of successive vegetative propagation.

Keywords

sprout development, disease, virus, tanoak, northern California

Citation

McDonald, Philip M.; Vogler, Detlev R.; Mayhew, Dennis. 1988. Unusual decline of tanoak sprouts. Res. Note PSW-RN-398. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 4 p.