2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
The subcorn leaf roll (also called cherry) can be found everywhere. This cute butterfly harms apple trees, plums, pears, peaches, apricots, cherries, cherries, mountain ash. Trees attacked by this pest do not grow well and bear fruit poorly, so it is imperative to take appropriate measures against intruders
Meet the enemy
Insects are butterflies, the front wings of which are decorated with a bright pattern of alternating spots and stripes. They are formed by metallic-shiny, yellow-orange and dark brown scales. The hind wings of the enemies of garden trees are brown-brown in color, they are framed by a shiny yellow-gold fringe. Their wingspan is 15 - 18 mm.
The eggs of subcrustal leaf rollers are black-red, round and flat, 0, 9 - 1 mm in diameter. The length of the caterpillars is 11 - 14 mm, they are translucent, with gray-brown anal and prothoracic scutes and a yellow head. Pupae of these insects are also very pretty - black-eyed, dark yellow, 7 - 8 mm in size. Only one generation of leaf rollers develops per year.
A favorite wintering place for caterpillars of different ages is the bark of fruit trees. In spring, they feed on sapwood and bast, gnawing through winding corridors in them and covering them with soft cobwebs. With the onset of April-May, harmful caterpillars pupate in cradles. Before the flight of butterflies begins (12 - 20 days after pupation), the pupae half protrude from the bark. The escaped butterflies lay their eggs in the cracks of the bark in the lower parts of the trunks, as well as in the roots and wounds on the bark above the surface of the earth. Fertility of subcrustal leaf rollers is up to 100 eggs. After 7 - 9 days, caterpillars revive from the eggs, penetrating into the bark and making numerous passages in it. With the onset of cold weather, they enter diapause.
It is not difficult to detect damage on the bark: corks from excrement glued together by cobwebs stick out from the bark in the damaged areas, and a little gum flows out in the morning. In a number of varieties of cherries and cherries, growths and sagging can additionally form.
Pest control
A considerable number of parasites and predators regularly reduce the number of subcrustal leafworms. For example, voracious pest caterpillars are delicious food for predatory beetles from a wide variety of families, as well as for predatory bugs, representatives of the families Anthocoridae and Nabidae.
Also, the laid eggs are infected with trichograms, and caterpillars with pupae are periodically infected by endoparasites from the families of flies tahin, chalcid, eulofid, braconid, and also ichneumonids.
The very hidden lifestyle of caterpillars significantly complicates the fight against them, therefore it is necessary to fight parasites when they are most vulnerable. It is best to do this before the trees begin to bloom.
Dead bark layers should be periodically scraped off and burned. Some gardeners practice killing caterpillars by cutting them off the bark. Also, in order to avoid the attack of parasites, it is important not to allow the placement of sections of the root system on the surface.
A good effect can be given by whitewashing the root collar and tree trunks with a twenty percent suspension of chalk or white clay, to which 2% karbofos or another organophosphorus preparation should be added. In some cases, pheromone and light traps also help.
During the mass summer of butterflies, the root collar, skeletal branches and tree trunks are sprayed with various insecticides. Often the time for such processing coincides with the start of processing from the first generation of codling moths. Spraying is usually carried out with pyrethroids, neonicotinoids and organophosphorus compounds. It will also be expedient to use bacterial drugs: bitoxibacillin, lepidocid, bicol or phytoverm.
At the beginning of the emergence of butterflies, damaged root collars and trunks are sprayed with a 1% solution of phosphamide or karbofos; after precipitation, the procedure must be repeated.
You can also prepare such a decoction for spraying. A kilogram of shag or tobacco should be poured with ten liters of water and boiled for half an hour in a tightly sealed container. The resulting broth is infused throughout the day, then thoroughly squeezed out, filtered, diluted with water 2 - 3 times. At the very end of cooking, 40-50 g of soap is added to it.
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