THE USE OF PATHOGENS FOR BIOLOGICAL CONTROL OF HYDRILLA, A SUBMERSED AQUATIC WEED
Shabana,, Y., Charudattan, R. (2003). THE USE OF PATHOGENS FOR BIOLOGICAL CONTROL OF HYDRILLA, A SUBMERSED AQUATIC WEED. EKB Journal Management System, 28(7), 5351-5364. doi: 10.21608/jpp.2003.252507
Y. M. Shabana,; R. Charudattan. "THE USE OF PATHOGENS FOR BIOLOGICAL CONTROL OF HYDRILLA, A SUBMERSED AQUATIC WEED". EKB Journal Management System, 28, 7, 2003, 5351-5364. doi: 10.21608/jpp.2003.252507
Shabana,, Y., Charudattan, R. (2003). 'THE USE OF PATHOGENS FOR BIOLOGICAL CONTROL OF HYDRILLA, A SUBMERSED AQUATIC WEED', EKB Journal Management System, 28(7), pp. 5351-5364. doi: 10.21608/jpp.2003.252507
Shabana,, Y., Charudattan, R. THE USE OF PATHOGENS FOR BIOLOGICAL CONTROL OF HYDRILLA, A SUBMERSED AQUATIC WEED. EKB Journal Management System, 2003; 28(7): 5351-5364. doi: 10.21608/jpp.2003.252507

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, Page 5351-5364  XML PDF (1.67 MB)
Document Type: Original Article
DOI: 10.21608/jpp.2003.252507
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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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