Herbicide Treatments To Control Invasive And Nuisance Aquatic Plants

Each application of herbicides is unique, depending on the needs of the lake environment. LRS works closely with homeowners, lake management, and county agencies to achieve the desired results of the application.

LRS uses an herbicide tank mix method, applying the herbicide with an airboat. Based on LRS's research and experience, it is known that a high level of efficacy can be accomplished by using two (2) different herbicides with different modes of action over the same area. This practice also prevents herbicide resistance to specific compounds from occurring after application.

LRS has (3) airboats set up specifically to work with Aquatic Invasive Species. These vessels are designed to work in shallow water and in areas with submerged obstacles, such as logs and rocks. They are also capable of deep water injection. The vessels are designed with large work platforms and carry three (3) personnel and up to 1000 lbs of herbicide. They can be maneuvered in tight areas and turn 360 degrees either moving forward or backward. This allows accurate applications close to shorelines and around boat docks.

Liquid formulations are delivered using four foot (4') galvanized pipe connected together using a 3/4 inch diameter hose as a knuckle to allow movement when the pipe is applying product next to the bottom of the lake. Weights are added on the bottom of the pipe to ensure that the pipe hangs vertically from the boat.

LRS has two (2) delivery systems for treatment.  A shallow water delivery system (SWDS), which has five (5) tubes delivers calibrated herbicide to the weed bed.  This system is very effective in littoral zones up to seven (7) feet.

LRS has also developed a Deep Water Delivery System (DWDS).  This system quick couples to the same 3” hose that supplies the (SWDS).  This system has a 30 foot hose.  TEquipmenthe hose has a 45 degree fitting and two 10 lb weights.  The 20 lbs allows the device to be lowered with a hand crank.  There are one (1) foot graduations on the hose.  The hose will be lowered by the mixer/loader to the prescribed application depth chosen.  If the hose hits the bottom, the weights protect the plumbing from damage.

The DWDS deposits the mixed product under pressure beneath the boat.  The flat, heavy hull of the airboat washes the applied product with the lake water.  Mixing to the proper concentration will occur quickly contacting all absorption sites of the plant.

Monitoring

LRS uses BioBase, a revolutionary bathymetric and aquatic vegetation mapping software, that uses a combination of acoustic data collection techniques and powerful cloud computing. We gather sonar and GPS data on the water and then upload these data logs to the BioBase System for automated processing. The data can be used to analyze vegetation, soil composition and bathymetry. The BioBase System offers “virtual eyes underwater,” and is a truly revolutionary tool for the future of aquatic management.

BioBase measurements are taken before treatment and approximately three (3) weeks after treatment to record reduction in biomass.

 

 

 

 

Shallow Water Delivery System (SWDS)

Liquid System Top View

Deep Water Delivery System (DWDS)

Liquid System Side View

DWDS DyeDWDS

 

 

 

 

 

Blue dye is used to show where herbicide is applied (shown below)