southern chinch bug and weed occurrence in st augustinegrass
Download
Skip this Video
Download Presentation
Southern Chinch Bug and Weed Occurrence in St. Augustinegrass

Loading in 2 Seconds...

play fullscreen
1 / 16

Southern Chinch Bug and Weed Occurrence in St. Augustinegrass - PowerPoint PPT Presentation


  • 67 Views
  • Uploaded on

Southern Chinch Bug and Weed Occurrence in St. Augustinegrass. C. Rainbolt, R. Cherry, and R. Nagata Everglades REC/University of Florida-IFAS Belle Glade, FL. Introduction. St. Augustinegrass lawns are utilized throughout the southern United States Climactic and environmental adaptation

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Southern Chinch Bug and Weed Occurrence in St. Augustinegrass' - ciaran-adams


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
southern chinch bug and weed occurrence in st augustinegrass

Southern Chinch Bug and Weed Occurrence in St. Augustinegrass

C. Rainbolt, R. Cherry, and R. Nagata

Everglades REC/University of Florida-IFAS

Belle Glade, FL

introduction
Introduction
  • St. Augustinegrass lawns are utilized throughout the southern United States
  • Climactic and environmental adaptation
  • Tolerance to sun
weeds in turf
Weeds in Turf
  • Create visual disruptions of uniformity that reduce aesthetic appeal
  • High plant densities can prevent weeds from becoming established
  • Actively growing plants are more able to compete with weeds than weakened plants
  • Biotic or abiotic conditions that weaken grass stands can result in increased weed populations
southern chinch bug
Southern Chinch Bug
  • Blissus insularis Barber is the most damaging insect pest of St. Augustinegrass
  • Ability to develop resistance to insecticides and overcome host resistance
  • Heavy infestations cause substantial damage to St. Augustinegrass that leading to dead brown patches of turf

Photo by Mr. Jim DeFilippis (www.turfgrass.com)

arthropods x weeds
Arthropods X Weeds
  • Norris and Kogan (2000) published a thorough review of arthropod and weed interactions
  • Although many relationships between arthropods and weeds are recognized, few are documented
  • Interaction can result in habitat modification that favors the development of one or both species
background and objective
Background and Objective
  • In southern Florida, weed infestations commonly occur in areas with southern chinch bug (SCB) infestations
  • The objective was to determine if SCB caused higher weed populations in St. Augustinegrass
materials and methods
Materials and Methods
  • Eight sites were sampled from March to August, 2005 in urban lawns in Palm Beach County, Florida
  • Each site contained 3 distinct habitats (5 x 5 m each):
    • Active SCB infestation
    • Weedy St. Augustinegrass
    • Green healthy appearing St. Augustinegrass
southern chinch bug sampling
Southern Chinch Bug Sampling
  • Sampled by vacuuming five randomly selected 30 x 30 cm areas for 2 min using a modified blower/vacuum
  • Samples were frozen for later counting, thawed, and passed through a sieve to remove debris
  • Counted by microscopic evaluation
weed sampling
Weed Sampling
  • Following chinch bug sampling, weeds were counted and recorded by genus and species within five randomly located 0.4 m2 subplots in each habitat
  • St. Augustinegrass groundcover was estimated visually on a scale of 0 to 100
  • Data from the eight sites were pooled and mean differences were determined using LSD test
scb results
SCB Results
  • SCB populations are similar to other studies
  • SCB are highly aggregated at infestations with few in surrounding healthy St. Augustinegrass
  • Superimposing SCB and weed data shows that weeds were infesting areas of chinch bug damage since chinch bugs had little attraction to weedy habitats
weed results
Weed Results
  • Weed populations were higher and St. Augustine groundcover was lower in the SCB infested habitats
  • 28 weed species were identified, 7 were monocots
  • SCB breed exclusively on monocots
  • The most commonly found species were southern crabgrass, common bermudagrass, small hop clover, Hyssop spurge, and green killinga
  • Healthy sites contained an average of 3.8 ± 2.6 different species compared to 6.8 ± 4.3 in weedy and SCB infested habitats
discussion
Discussion
  • Data did not indicate that certain weed species were more able than others to capitalize on SCB damage and become established
  • The prevailing weed species in the healthy habitat tended to be the dominant species in infested and weedy habitats
conclusions
Conclusions
  • When damage reduces groundcover, resources become available to other species that are not affected
  • After SCB infestations are reduced through insecticidal and/or natural controls, the weed problem remains
  • Consequently, weed suppression as a result of SCB should be considered when determining the economic threshold for control in St. Augustinegrass
ad