Subject: Re: [NAFEX] Japanese beetle or Rose Chafer?
Date: Wed, 04 Jul 2007 21:55:13 +0000
Sorry for delay in adding to this. But is anyone else familiar with the
"summer rose beetle"? It looks more like the j-beetle than the rose chafer,
but appears w/ rose chafers. Steve (howdy "neighbor"), WI has had summer
rose beetles for at least 20 years but j-beetles only recently.
Interesting, the semi-wild "pioneer roses" which grow at my house bloomed a
little early, and were fading anyway when the ravenous rose chafers & rose
beetles emerged, and I think they were a bit late. Effect of the early
April freeze & snow? I think I'm seeing more differences in insect activity
then plant damage, from that weather.
----Original Message Follows----
From: <dmnorton>
To: "North American Fruit Explorers"
Subject: Re: [NAFEX] Japanese beetle or Rose Chafer?
Date: Sat, 23 Jun 2007 17:53:01 -0500
Message Here's the best profile of both that I have used. It comes from
http://www.ipmcenters.org/cropprofiles/docs/MIlabruscagrapes.html. Sorry I
couldn't get to it sooner when Jim asked about the same pests. We use
Imidan for both since Surround will work on Japanese Beetle but not on
chafers. Hope this helps!
Japanese Beetle, Popillia japonica Newman[pic]
Life Cycle: Japanese beetles begin to emerge in early July and can be found
through September. Beetles leave their tunnels during the morning of clear
days for feeding and mating. They return to the soil in the late afternoon
or evening to spend the night and also remain in the soil on cold wet days.
The beetles lay their eggs underground in grassy areas in mid summer. The
eggs hatch in late July and the larvae go through three molts before fall.
They are less than 1/15 of an inch long when they first hatch and may be as
large as 1 inch at third stage larvae. The white, C-shaped larvae (grubs)
feed on grass and weed roots and overwinter further underground in these
areas. Grubs move up into the root zone during April and May to feed and
reach maturity (5, 42).
Damage: Adults feed on the upper surface of the foliage between the veins,
leaving a lace-like skeleton. Leaves turn brown and die if feeding is
severe, but berry clusters are not attacked. Japanese beetles can be a
problem particularly in new vineyards using grow tubes (5, 42).
General Control Information: Labrusca vines are naturally resistant to
feeding by Japanese beetles and tolerate some damage, but vinifera vines and
hybrids are more susceptible. Monitoring is required to reduce the risk of
damage. Traps are not recommended because they attract more beetles to the
vineyard. Birds and mammals reduce Japanese beetle grub populations
considerably by feeding on large numbers of grubs during the early spring
and fall. Chemical controls include: Imidan, Sevin, Danitol and Surround
(24).
Rose Chafer, Macrodactylus subspinosus [pic]
This general feeder is related to the Japanese beetle, sharing a similar
life cycle (6).
Life Cycle: Larvae (grubs) overwinter in the soil, resuming development in
the spring. Adult beetles emerge in late May or early June, near the time of
grape bloom and live for 3- to 4 weeks. They are about 0.5 inch long with a
tan body, dark brown head and long legs. Males and females congregate on
plants to mate and feed on blossoms, newly set fruit and leaves. Mating and
egg-laying occur continuously for about two weeks with each female
depositing eggs just below the surface of sandy soil. In about two weeks,
eggs hatch and the grubs remain in the soil until they pupate in the spring.
This pest is more common in areas with light sandy soils. There is only one
generation per year (6).
Damage: Rose chafers feed on green tissue. Feeding damage is most obvious on
the leaves though the greatest impact can be on young clusters when adult
beetles remove the developing berries (42).
General Control Information: Vigilance must be maintained early in the
season in case of high rose chafer populations. In severe cases, blossom
buds are completely destroyed, resulting in little or no grape production.
Bloom-time sprays for grape berry moth will control rose chafers (6).
Chemical controls include: Guthion, Imidan, Lannate, Sevin, and Danitol
(24).
----- Original Message -----
From: loneroc
To: North American Fruit Explorers
Sent: Saturday, June 23, 2007 6:03 AM
Subject: Re: [NAFEX] Japanese beetle or Rose Chafer?
How does one tell these apart? I think the beetles on my rugosas are the
chafer, but I read that Japanese beetle has recently arrived in the area.