Page 23 - Griffin Gazette Q4 2017
P. 23

sanitation products such as Greenshield II, Kleengrow, SaniDate 5.0
        and Zerotol 2.0 can be used to finish the job and ensure a clean start.
        Control options
        Chemical control of fungus gnats and shoreflies should target the
        larval stage because the control of the adults is not very effective
        with the available pesticides. Table 1 lists products recommended
        by GGSPro. Check the Digital Gazette for more details on these
        products including rates, REIs and more. All treatments are made
        to the soil.
        Biological control often begins with soil treatments with nematodes,
        which  are  highly  successful  in  controlling  the  larval  stages  of
        fungus gnats and shoreflies. S. feltiae is used for fungus gnats and
        S. carpocapsae for shoreflies. Nematode treatments are generally
        effective for about 3 weeks and can be applied to all types of crops
        and most types of growing media. Following treatment, the number
        of adults will decline gradually as the adults die off and fewer
        emerge from the soil to replace them. Dalotia coriaria, (aka Atheta
        or rove beetle), is a small beetle with a huge appetite for many soil
        dwelling pests, including fungus gnat and shorefly larvae, with the
        thrips pupae control as an added bonus. Once established in a
        cool moist location, they will often establish themselves in the crops.
        Stratiolaelaps scimitus, formerly known as Hypoaspis miles, is a
        tiny predator mite that patrols the soil surface and feeds on many
        of the same soil dwelling pests that Dalotia does. In greenhouses
        where pesticides are seldom used, the aptly named Hunter fly
        (Coenosia attenuate) will sometimes appear as a welcome ally.
        Hunter flies consume adult fungus gnats and shoreflies along will
        some other flying insects. They are not commercially available at
        this time but they have been introducing themselves to commercial
        greenhouses in the northeastern U.S. Use yellow sticky cards to
        monitor for adult fungus gnats and shoreflies and deploy the BCAs
        at the first sign of pest pressure. Certain compatible pesticides
        can be safely used in conjunction with biological control agents.
        Contact GGSPro for assistance. The  Digital Gazette  contains
        trade names, application rates and tips for success with all of the
        mentioned BCAs. Bulletins with the same information are available
        upon request.
        Read and follow all label directions. The label is the law!  Products
        other than those mentioned may be safe and effective. Some
        pesticides may be restricted use or unregistered in certain states.
                                                                    YOUR FIRST LINE OF DEFENSE

                                                                         Bioline is a company active in
                                                                             the field of biocontrol.

        Image 1- Fungus gnat   Image 2- Fungus gnat   Image 3-Shorefly adult
        damage on dahlia leaf  larvae with distinctive   displaying spots on the
                          black head capsule-   wings
                          Photo credit: Bioline

        Image 4- Shorefly   Image 5- Dalotia   Image 6- Hunter Fly
        pupae- Photo credit:   adult feeding on   (Coenosia attenuata)
        Bioline Agrosciences  fungus gnat larvae-   Photo credit: Leanne
                           Photo credit: Bioline   Pundt, UConn

             Digital  Bonus  Content |
   18   19   20   21   22   23   24   25   26   27   28