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The first Japanese beetle found in Canada was inadvertently brought by tourists to Yarmouth, Nova Scotia, by ferry from Maine in 1939. During the same year, three additional adults were captured at Yarmouth and three at Lacolle in southern Quebec. [7] Japanese beetles have been found on the islands of the Azores since the 1970s. [8]
Japanese stag beetles are large, smooth, dark brown to red brown beetles, measuring 26 to 75 mm in length. Males are larger than the females and have mandibles which are enlarged and much longer than the female's. [3]
Male Japanese rhinoceros beetles fighting. A. dichotoma are well known for their male aggressive behavior. Males will often use their large horns to fight other males over territory and the access to female Japanese rhinoceros beetles. [3] These beetles will often fight on the trunks of host trees to determine who will keep or gain the territory.
Maladera formosae, commonly known as the Asiatic garden beetle and formerly known as Maladera castanea, is a species of beetle in the family Scarabaeidae.It is native to Japan, China, South Korea, North Korea, and Russia but was introduced to North America in the 1920s where it is considered a pest of turfs, gardens, and crop fields.
The invasive pest that feeds on hundreds of plants usually begins showing up around the Fourth of July, and it's right on time this year.
The sexual dimorphism between male and female beetles in the genus Rhipicera has been attributed to using scent in mating behaviors [2]. The antennae of males and females differ in that the males have lamellate antennae while the females' antennae are significantly smaller in comparison [ 2 ] .
Male and female beetles are attracted to carrion for reproduction and feeding. Male N. orbicollis attract females by emitting pheromones but they will only do so when a carcass is present. After mating, the female will lay her eggs from about 12–48 hours after discovering a suitable carcass. Eggs hatch around 56 hours after oviposition.
If you suspect you have seen Japanese beetles, take a photo and report the sighting at agr.wa.gov/beetles or email the photo along with the location of the sighting topest@agr.wa.gov.