Page 17 - Griffin Gazette Issue 2 - 2018
P. 17

you receive from a well-designed scouting   susceptible to mites. Before the crop   Amblyseius andersoni  (Anderline) this
         program is crucial to the outcome of your   arrives is the time to do your homework.   predator mite has a wider temperature
         pest  control  programs.  Early  detection   Work with your BCA advisor to have a   range that most BCAs. They are active and
         of mites is crucial given how rapidly they   plan in place from the beginning of the   effective from 43-100°F. It will also feed on
         reproduce. Biological control agents   crop. Ordering BCAs in advance gives   pollen and thrips larvae to survive when
         (BCAs), are best suited to prevention   your supplier the best chance of having   mite populations are low. Because of the
         and early intervention rather than trying   the product delivered when you need and   low temperature tolerance they can be
         to come from behind. Unlike miticides   expect it. This also gives you a chance to   established in the crop much earlier in the
         that  we  can  store  on  site for  quick  use,   consult with your plant suppliers to find out   season than other predators to help keep
         there is some delay between placing an   which pesticides they use in production so   spider  mites  from getting  established  in
         order for BCAs and deploying them into   residual side effects can be anticipated.   the crop in the first place. Andersoni are
         the crop. Don’t give the mites any more   GGSPro is able to assist you with all   available in bulk for distribution or mini-
         of a head start by inadequate scouting.   aspects of planning a BCA program.  sachets. The mini-sachets are breeding
         Scouting includes searching for the spider                             stations that produce large numbers of
         mites and their predators. This will require   Spider  mite  predators  Understanding   mites for 4 to 6 weeks. Check with GGSPro
         becoming familiar with the appearance of   the strengths and weaknesses of the   for proper placement of the mini-sachets
         the  various  predators  as  seen  through  a   various  predators  available  will  help  you   to ensure maximum effectiveness.
                                             create a plan with those BCAs best suited
         hand lens or other magnification devices.
         Entomologists tell us that spider mites   for your crops and production conditions.   Amblyseius californicus  (Californiline)
         are likely to first be found in areas where   Below is a quick look at some of the allies   has a well-deserved reputation for staying
         there is good air movement and therefore   in your corner as you face off with your   active at higher temperature and lower
         the lower humidity that they prefer. Scout   spider mite competitors:  humidity than other predator mites.
                                                                                Many parts of the country this makes
         more intensively along walkways, adjacent   Phytoseiulus  persimilis  (Phytoline,
         to intake louvers and similar locations   PERSIMILISforce)  predator  mite  that   californicus an important part of the spider
         along with your random scouting. Some   aggressively tracks down and consumes   mite control program. They can feed on
         growers have found it useful to produce   all life stages of spider mites. They do   pollen and some other pests to sustain
         a single bush bean plant in a 6 inch pot   not have any alternate hosts, so the ideal   themselves during times of low mite
                                                                                pressure. Californicus are available in bulk
         to serve as an early warning plant. Spider   release time is at the first sign of spider
         mites are uniquely attracted to bush beans   mite activity. They can be used under   for distribution or mini-sachets.
         and the flat leaves show feeding damage   cover or outdoors when night temps are   Other  Amblyseius species of mites
         easily to aid in early detection. Scatter a   65°  or higher.  Persimilis  have  been  used   including  cucumeris  and  swirskii  also
         few throughout the greenhouse especially   successfully on a wide variety of crops.   contribute to spider mite control, even
         in areas of high air movement.      Griffin  has  domestic  sources  for  rapid,   though thrips are their primary target. This
                                             cost-efficient delivery. They are shipped   is  especially  true  when  they're  being
         Miticide transition  Some of the
         pesticides commonly used in greenhouses   in a bottle or vial for tapping out onto the   used  at  high  rates  either  through bulk
         have negative impacts on BCAs for weeks   lower leaves of affected plants.   applications or mini-sachets.  Feltiella
                                                                                acarisuga is a predatory midge that is
         or even months. A transition from a miticide
         based control system to one emphasizing                                sometimes used as part of a spider mite
         BCAs starts with a review of all pesticides                            control program as well. Be encouraged,
         applied over the past 8 weeks. It may                                  there are several natural enemies of
         be necessary to begin the transition                                   spider mites! The next step for those new
                                                                                to BCAs, or for those who have a few
         by employing miticides with shorter
         residuals while more persistent residues                               seasons  under  their  belt  but  could  use
         are breaking down. Don’t view this as a                                some  further  guidance,  now  is  a  great
         setback, it is just a part of preparing for                            time to contact your BCA expert to set you
         success. GGSPro maintains an extensive                                 on the right path. GGSPro is available to
                                                                                assist you.
         database  of  pesticide  compatibility
         with BCAs that can help you to make
         informed decisions.
         Planning to succeed  Attempting to
         begin a BCA program in the middle of the
         crop  when  mite  pressure  is  already  high
         is setting your crop up for a rough ride.
         Your years of experience have helped you    Persimillis feeding on a spider mite.
         to  understand which  crops  are  highly   Photo credit: Bioline AgroSciences

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