THE USE OF PATHOGENS FOR BIOLOGICAL CONTROL OF HYDRILLA, A SUBMERSED AQUATIC WEED | ||
| Journal of Plant Production | ||
| Article 10, Volume 28, Issue 7, July 2003, Pages 5351-5364 PDF (1.67 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpp.2003.252507 | ||
| Authors | ||
| Y. M. Shabana,1; R. Charudattan2 | ||
| 1Plant Pathology Department, Faculty of Agriculture, Mansoura University, EI-Mansoura, Egypt; | ||
| 2Plant Pathology Department, University of Florida, Gainesville, FL, USA | ||
| Abstract | ||
| During a one year survey for microorganisms associated with hydrilla (Hydrilla verticillata), approximately 2200 microbes were recovered from hydrilla, surrounding water, and sediment coflected from 10 man-made ponds and three natural lakes in Florida, USA. A representative selection of fungi (651), bacteria (330), and actinomycetes (38) from this collection was screened against hydrilla in bioassays. Severity of damage (DS) was determined on a scale of 0 to 4, where 0 = healthy, 1 = 1-25% damage, 2 = 26-50% damage, 3 = 51-75% damage, and 4 = 76-100% damage (100% = complete kill). Of the 1019 isolates that were examined in this manner, none of the actinomycetes were pathogeniC on hydrilla. however 2 strains of bacteria (0.6% of the bacteria tested), and 42 isolates of fungi (6.5% of thl fungi tested) were effective at DS level 4 on hydrilla 3 weeks post inoculation Fungi and bacteria capable of killing hydrilla are considered to have potentia as biocontrol agents or as sources of novel herbicidal metabolites. These~ included Acremonium sp., Botrytis sp., Curvularia sp., Cylindrocarpon sp.,' Fusarium culmorum, and F. moniliforme. The blocontrol potential of F. culmorum has been established in several tests. For maximum bioherbicidal activity of this fungus against hydrilla, its inoculum should be applied at a rate of 5 x 105 conidia/ml at 20 to 25°C water temperature. | ||
| Keywords | ||
| Hydrilla verticillafa; submerged aquatic plant. biological control; bioassay; spore production; temperature; Fusarium culmorum; Acremonium sp; Botrytis sp; Cylindrocarpon sp | ||
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