Friday, July 12, 2013

Ten-lined June beetle

so colorful, so beautiful. This little guy was actually about 2 inches long and it hissed when my best friend moved it to safety.
Tenlined June beetle

Polyphylla decemlineata (Say)
(Coleoptera: Scarabaeidae)

-- Elizabeth H. Beers, Everett C. Burts, and R.A. Van Steenwyk
(originally published 1993)


Gallery
The tenlined June beetle is widely found in sandy soils west of the Rocky Mountains. Larvae feed on plant roots and can weaken or kill the plant. Adults feed on foliage but do not cause economic damage to fruit trees. Infestations spread slowly because of a lack of movement by mated females and the long time span of each generation, which can be up to four years in the Northwest.


Hosts
Hosts of the tenlined June beetle larvae probably include all deciduous tree fruits grown in the Pacific Northwest. Infestations in Washington tree fruits have mostly been associated with apple. The tenlined June beetle has also been well studied as a pest of almonds in California. Other hosts include strawberries, cane fruits, roses, potatoes, corn, and possibly willow and poplar.

In Washington, grubs have been found in areas of sagebrush on sandy soils, although the exact hosts are undetermined. Adults feed on leaves of many broadleaf trees and some conifers.

Tenlined June beetle adult (E. Beers)


Life stages
Egg: Eggs are large, oval and a dull, creamy white. They can measure up to 1/6 inch (4 mm) long.
Larva: The grub is a typical C-shaped scarab larvae. The first instar is less than 1/2 inch (12 mm) long, while the full grown third instar is 1 to 2 inches (25 to 50 mm). It has a brown head and three pairs of legs on the thorax. The dark brown contents of the gut can often be seen through the exoskeleton at the tip of the abdomen.
Pupa: The pupa is preceded by a prepupal stage. The pupa is cream to light tan, about 1-1/2 inches (25 mm) long, with external wing pads,
Adult: The adult beetle is 3/4 to 1-1/2 inches (20 to 35 mm) long. It is brown with conspicuous white stripes on the elytra, pronotum and head. Its antennae are distinctly clubbed.

Tenlined June beetle larvae on roots of stunted tree (E. Beers, July 1992)
On the male, the lamellae of the club are long, flat, tongue-shaped plates and the club is one and a half times as long as the rest of the antennae. The female has a shorter, more compact club, about 1/2 to 1/3 as long as the rest of the antenna.


Life history
The larval period can last 2 to 4 years in the Northwest, depending on the site and the length of the growing season. Most older grubs are found in the top foot of the soil, where they feed on woody roots, while younger grubs live deeper in the soil and eat the finer and more tender roots. Most of the damage to the tree is done by the older grubs. The grubs begin to pupate in May and June in pupal cells a few inches below the soil surface. The cells are about 2 inches (50 mm) long and 3/4 inch (18 mm) wide

Tenlined June beetle larva (3rd instar) (H. Riedl)
pupal period lasts about 5 weeks. Adult activity begins in June or July and continues until fall. The adult bores an emergence hole from the pupal cell to the soil surface but may not emerge immediately. Adults stay under cover during the day, hiding in weeds or grass in the orchard. They make a peculiar wheezy, hissing noise when disturbed. They become active around dusk and are active longer on warm nights. There is little activity when temperatures are below 60ûF. Males are attracted to females by a sex pheromone. They mate at or near the female's emergence hole, and she often lays eggs in the same hole. Dispersal of females may be very limited.

Females lay 60 to 70 eggs in the soil. The eggs hatch in about 3 to 4 weeks. Young larvae feed on decaying vegetable matter or fine roots. They take 3 to 4 years to develop fully. In cold-winter climates, larvae may move deeper in the soil to avoid frost and move closer to the surface again in the spring to continue feeding.


Damage
The grubs' feeding on the roots can weaken or kill the tree. Adults feed on plant foliage but cause little damage.


Monitoring
Problems with tenlined June beetle have most often occurred when a sandy, virgin soil, formerly with sagebrush as the dominant plant, has been planted to orchard. Young trees in this situation that grow poorly, despite adequate irrigation and nutrients, should be examined for grubs. An untreated problem may persist many years after the orchard is planted. Severely affected trees can sometimes be pulled easily from the ground because there are no longer enough roots to anchor them. Sample several trees that appear to be stunted or water stressed. Dig up an area around the tree about 3 feet in diameter and a foot deep and sift through the soil and roots for grubs. With older trees, dig a trench in the herbicide strip in the tree's root zone and look for grubs.

Adult males can be monitored with a blacklight trap and will also be attracted to ordinary lights during flight. They can be found in large numbers gathered around lights in heavily infested areas in mid- to late summer.


Biological control
Birds eat exposed grubs, while bats and owls attack adults. The grubs are parasitized by a large tiphiid wasp, and adults are parasitized by the flesh fly.


Management
Check for grubs when planting trees into virgin soil where sagebrush has grown. In unirrigated soil, the grubs may have moved down deep to obtain moisture. Where feasible, tilling the soil when grubs are near the surface in spring and summer helps expose them to predators and parasites. Where infestations are severe, trees may have to be removed and the soil fumigated.

beautiful body

ten-lined June Beetle

Sunday, June 16, 2013

Moving forward

When you pick up anger to fight, you obliterate any chance at peace. Ultimately what do you want, a world of peace or a world of dying? I burned and demolished the bridge with the clowns today. It is the only way I can protect myself from being vulnerable. It doesn't even hurt, I shed many tears in the battle, lost the blood I put into it with my need to be right, and it was totally worth it. Ultimately they are a strong army in their ego driven journey, but their path is different than mine. We share a few basic belief's for our world with two completely different road maps. Theirs is not right or wrong, just not for me. I do not think this world is ready to exist without some form of organization and set of rules that protect all humans. Until we can have that in place, we will just have to work with what we have and make it become what we need it to become. I do not know if I stand politically for anyone or anything at this point, I am sick of government and I tell you, the anarchists are fucking scarey, and I would rather have a few rules to keep them in check, then trust them to self govern themselves. This did teach me one thing... I want to be the change... I want to start a clown group, I want to make public service announcement videos with clowns, I want to protest peacefully. I want to continue to use my art as a way to help others heal.