While several calendar week subsequently than last year , Japanese beetle definitely have arrive in Minnesota . I saw several on a garden tour last weekend and nurseryman on the MSHS Facebook page chime in that many have been seeing the beetles for at least a week . Jeff Hahn , one of the bug experts at the University of Minnesota Extension Service , wrote about them on July 10 .
Here ’s the 411 on Nipponese beetles .
solid food , Appearance , Lifecycle
While they prefer roses, Japanese beetles will attack many plants, including daisies.
Japanese beetle are most likely to begin their attack with roses , but once they get in a 1000 or garden , they will eat on almost anything useable , include geranium , hollyhocks , Linden tree , beans , grapes , vine and fruit trees . Beyond roses , raspberry are a particular favorite . They typically feed in mathematical group and it ’s easy to spot them at the top of flora because of their iridescent green color and relatively with child size of it . While not harmful to man or creature , a unfit infestation of Japanese mallet can defoliate a plant in a day .
Beetles are about a half - inch long with a lustrous , two - tone green and tan back . They are distinguished from other beetles , such as the pink wine chafer , by their tufts of white-hot hair , five on the side and two at the behind . The beetle overwinter as grubs in the grunge and may be a more serious scourge to turf grass than to plants , but they can fly long distances , so the beetle in your yard did not necessarily hatch there . grown beetle emerge in July and for the next six to eight weeks go on a feeding delirium . In the two months she is active , a typical female Japanese beetle will lay about 60 testis .
Treatment Options
This pretty ‘Dainty Bess’ rose is just what the beetle likes. Note the two hair tufts on his back end–an identifying mark on Japanese beetles.
If an plague is not severe , the in force approach is to hand - pick the beetle and drop them in a bucketful of soapy piss , where they will die . You will tend to see more beetles on sunny days . It ’s also a good musical theme start picking and wipe out beetles when you first see them because the front of beetles attracts other mallet . Do notsquish the beetle , no matter how tempting ! It only attracts more .
you may find beetle yap for sales event , but their effectuality isnot turn up . Because the gob are baited with the scent of geraniums and rosebush as well as the pheromone of beetle , some researcher believe the cakehole in reality attract more mallet to your yard .
Insecticides can be used on the beetle grub ( in May ) and on the adult . However , many democratic insecticides , such as those using carbaryl , bifenthrin , and permethrin as an alive element , also can be highly toxic to birds , bees and fish . The infestation will not last always . Whenever you spray , follow package directions cautiously and be aware of potential spread of the insecticide .
— Mary Lahr Schier
