Leaf rollers control measures
Which only flying and crawling harmful «scourge» does not fall upon residents of green gardens, vegetable gardens.
Not always easy to know the «enemy» in the left traces at the crime scene (damage to different parts of the plants).
But there are insects that have their business card.
Thus, plant leaves, or twisted into a tube, or in bundles around the buds indicate the appearance of the area and moths of the leaf.
By itself, this small and often externally nondescript butterfly any harm to plants does not cause. But the meaning of its existence – babies (caterpillars) can destroy up to 60% of leaves of plants and up to 50% of the buds and fruits.
Leafrollers are tortricids collection of butterflies, which has over 10,000 species, among which are very rare and almost pose no danger to plants, and ubiquitous and omnivorous gluttons.
The bulk of the caterpillars of leafrollers extremely picky with food – use all parts of the plant: the leaves and buds to fruits.
And pokorova leaf rollers feed sweetly soft young layers of wood. While omnivorous caterpillars eat and deciduous conifers, easily moving from the fruit trees and berry bushes on the forest and urban trees (birch, oak, poplar, Linden).
Depending on the species, the wingspan of the butterfly ranges from 15 mm to 30 mm, and their color from variegated light yellow to dark brown. The body of the butterfly thick, covered with numerous thick hairs.
Notice the butterfly leafroller is not easy: during the day she hides in secluded places, and dull coloring of the wings allows it to remain unnoticed in the evening.
External unattractiveness of a butterfly perfectly performs masking function makes it invisible on the background of tree bark.
In Russia, found a home about 70 species of leafrollers. Of these, the most common and harmful (for fruit trees and berry bushes) are: rosenow treatments, borax, colorful, gold, net, grape, podborovye.
Insects these species undergo the same life cycle and differ from each other color (like butterflies and caterpillars), size and a little «manners of behavior».
Intense flight of moths begins in may and lasts until the beginning of August, during this time, the insect manages to give two generations. On the second or third day after departure, the butterfly begins to lay eggs.
Depending on the species, leafroller place of oviposition on the leaves and buds of trees and on the bark of trunk and branches of trees. In one clutch of up to 60-80 eggs. In just one generation of butterfly lays up to 250-300 eggs.
On 10-12 day eggs out of the caterpillar and begin its harmful activities. For caterpillar, hatched on the sheet, the latter is getting the house and food.
Using a dedicated network, caterpillar carefully turns the sheet across or along the main veins. Hungry insect sticks out from the house head and eats the edges of the coiled sheet.
Suddenly disturbed by pests fleeing is a cowardly escape – draw back, slide sheet and hang on the web. Caught in the web of the caterpillars are carried by wind to neighboring trees.
Leafroller, born on the ovaries or flower buds, eating them, gradually pulling together a web of leaves and blossoms into a ball.
With mass distribution, pests are not exempt from the fruit, gnawing their flesh. Often, the caterpillars with spider webs, attached to the fruit leaf, and under its protection they are doing their dirty» business.
Lives and feeds on the insect about a month. Bud moth first generation pupation occurs in feeding places. Females of the second generation protect their future offspring, capping laying a protective secretions from their genital glands.
Such spring flaps can be seen on the bark of trees, they are whitish, oval-shaped, a length of about 0.5 cm.
Measures to control the leaf rollers
The fight against leafrollers we need to start early in the spring, working ahead of the curve» — giving insects a chance to emerge from the eggs.
So before Bud plants, you can spray «Profilaktika» (500 ml / 10 liters of water). In addition, thoroughly inspect the trunks of the trees, and discovered in them lay to cut off and destroy. Basically masonry is placed at a height of 3 meters.
At the beginning of the summer to combat leafrollers tree can be processed «Isehara» (controller development and
insect growth), then the eggs will be postponed to the poisoned surface.
If the caterpillars have already managed to settle on the leaves and buds, is an effective treatment drugs: «Patrin», «accord», «Alhazen», «Gladiator».
It is not desirable to use highly toxic drugs after flowering, or summer is best to use a bacterial – «Fitofarm», «Akarin», «Bitoksibatsilin», «Bacilus, Thuringiensis».