Plant Pathology, Disease Control of Fruit and Vegetables

Coryneum Blight

Coryneum blight — also called shot hole disease, California blight, peach blight or pustular spot — is caused by the fungus Coryneum carpophilum. In Colorado it affects mainly peaches and apricots, and to a lesser degree sweet cherries. Severe foliar shot holing may weaken a tree,...
H. Larsen
Colorado State University Extension

White Mold of Dry Beans

One of the most important diseases affecting dry beans in western Nebraska and Colorado is white mold caused by the fungus Sclerotinia sclerotiorum. In recent years, losses from this disease have averaged as high as 20 percent, with a few individual field losses exceeding 65 percent. White mold is...
H.F. Schwartz
J.R. Steadman
D.S. Wysong
E.D. Kerr
Colorado State University Extension

Rust of Dry Beans

Rust is an important disease that affects dry beans in eastern Colorado, western Nebraska and surrounding regions. The disease is caused by the fungus Uromyces appendiculatus, which has caused periodic epidemics in this region during the last 50 years. Recent losses from the disease have exceeded...
H.F. Schwartz
J.R. Steadman
D.T. Lindgren
Colorado State University Extension

Root Rots of Dry Beans

Many soil-borne fungal pathogens are widespread throughout dry bean and snap bean growing areas of Colorado and surrounding states. Yield losses range from a trace to 100 percent, especially when adverse environmental conditions persist after planting and through flowering. The most common...
H. F. Schwartz
Colorado State University Extension

Bacterial Diseases of Beans

Many bacterial pathogens occur throughout the dry and snap bean growing areas of Colorado and surrounding states. Yield losses due to bacterial pathogens (including seed size and quality) may range from a trace to 100 percent, especially when adverse environmental conditions persist during the...
H.F. Schwartz
Colorado State University Extension

Advanced Technology for Producing Healthy Seeds or Vegetative Materials

This Bulletins discusses programs for the propagation of disease-free seedlings and other planting materials. The different types of transmissible plant pathogens are discussed: viruses, viroids, phytoplasmas and spiroplasmas, and bacteria. The different techniques of detecting them are discussed...
C.A. Chang
Food & Fertilizer Technology Center

Use of Tissue Culture for the Mass Propagation of Pathogen-Free Plants

Different in vitro culture techniques have been used for rapid plant propagation. Pathogen-free plants have been produced using techniques such as seed culture, meristem culture, micropropagation using axillary or adventitious shoot buds, and somatic embryogenesis. This Bulletin discusses the...
Hsin-Sheng Tsay
Food & Fertilizer Technology Center

Regeneration of Healthy Banana Plantlets from Banana Bunchy Top Virus-Infected Tissues Cultured at High Temperatures

Exposure of Cavendish banana plantlets infected with banana bunchy top virus (BBTV) to a temperature of 40oC for 16 h daily for periods of up to 5 weeks did not free them from BBTV. However, BBTV was less readily transmitted by aphids from treated plants than from untreated controls. The same heat...
R.Y. Wu
H.J. Su
Food & Fertilizer Technology Center

Micropropagation of Cavendish Banana in Taiwan

This paper discusses the micropropagation of banana plantlets in Taiwan. The main purpose is to produce healthy plants that are free of virus diseases, particularly banana bunchy top and banana mosaic. The plantlets also have the advantages that they are more uniform than suckers, and the adult...
S.W. Lee
Taiwan Banana Research Institute

Biology and Virus Transmission of Citrus Aphids

Aphid species of the world which attack citrus and transmit citrus tristeza virus (CTV) are reviewed. Four aphids, Toxoptera citricidus, T. aurantii, Aphis gossypii and A. spiraecola, are all common species, and all of them transmit CTV. Their occurrence varies in different countries and...
Shinkichi Komazaki
Food & Fertilizer Technology center