Gardeners are well aware that a glass-case on a currant can cause a loss of yield, and in some cases death of a shrub. In the middle lane, at least 10% of the plants suffer from the pest. The fight against it is very difficult, as the larva hatched from an egg immediately gnaws a hole in a tender twig and penetrates inside. Due to the fact that it is protected from all sides, chemical exposure methods become ineffective. It remains only to cut off the shoot area infected with the larvae.
How to recognize a pest
An adult specimen is a small butterfly with yellow transverse stripes on a black abdomen and transparent glassy wings. She feeds on pollen, but makes eggs on the branches of currants and gooseberries, regardless of their variety and variety. Caterpillars from eggs appear 10-12 days after the currant fades. They remain very vulnerable until they get inside. In most cases, butterflies lay their eggs on damaged bark and very rarely on healthy shoots.
The branches of the shrub in which the larvae settled can be identified by shredding leaves, prone to wilting in hot weather and early decay. Little berries are tied to them, and even those are usually small and sour. Escape death occurs in the second year after infection. Larvae that wintered and grown by that time turn its inside into dust, after which the branch dries out and can break off spontaneously.
If you cut off the shoot affected by the pest, inside you will find a black cavity, partially filled with excrement, and sometimes a honey-colored caterpillar with a brown head. However, the light-walled passage, wholly clogged with excreta and sawdust, most likely indicates the presence of a narrow-bodied larva, not a glass-case. In both cases, it feeds on the stem core and moves down it. therefore young shoots should be cut to a healthy site, then another 3-4 cm, and then immediately burn. Lignified branches are cut to ground level, and stumps are smeared with garden var. They usually live two-year-old caterpillars, already descending to the base and ready for pupation.
Glass currant on currant: methods of struggle (video)
Methods of struggle
The life cycle of the pest lasts 2 years, but in the form of a butterfly, it exists only about a week. The laid eggs develop 10-20 days, depending on the air temperature. Pupae develop within 3-4 weeks. For the rest of the 2-year cycle, the glass-case exists in the form of an ever-growing caterpillar eating the shoots of currant from the inside. During its existence, it exterminates several branches, hibernates inside one of them, and the next year continues to feed and grow. Before pupating, the caterpillar makes a flying hole in the wood for the future butterfly, leaving only a thin layer of bark untouched.
However, winged insects do not fly out of pupae at the same time, so they can be observed for almost 2 months. Timely processing of plantings with chemicals leads to the mass death of butterflies and does not allow them to lay eggs. In order to accurately determine the beginning of summer, during which the fight against the glass-box should be started, some put bait next to the bush: a jar of fermented grated blackcurrant half diluted with water.
Spraying gooseberries and currants produced immediately after flowering. The consumption of the diluted drug is 1-1.5 liters per bush, depending on its size. The amount of biological preparations per 10 liters of water is taken as follows: lepidocide 20-30 g, bitoxibacillin 80-100 g, phytoerm - 20 ml. However, biological products are not very effective against larvae, so the fight against them is carried out using chemicals:
- 0.1% Fufanon solution;
- "Sparks M" and "Kemifos";
- 2.5% Kinmix solution.
Since the butterfly eats pollen on raspberry flowers before the flowering of currants, during early spring treatment with chemicals, one should not forget about it.
- For this purpose, long-acting preparations Agravertin and Fitoverm can be used. Processing is performed several times with an interval of 1.5-2 weeks.
- Large amounts of currant are sprayed twice with potent drugs: before flowering and after harvest. The solution is prepared from 10% karbofos (emulsion concentrate or wettable powder) or 10% trichloromethaphos-3 emulsion concentrate. The consumption of any drug per 10 liters of water is 75 g.
Is there a salvation from the glass
As you know, any pest control begins with prevention. You need to purchase only healthy planting material. Cuttings before planting in the soil, it is advisable to hold for 2-3 days at room temperature in sand soaked in biological preparations Nemabakt or Anthony F. "Anthem-F" is also suitable for spraying bushes at a time when the buds are just blooming. An Aktara insecticide is added to the water for irrigation (use ceases 3 weeks before berry picking). To scare away the butterflies of the glass case, elderberries are planted near the currant, and marigolds or calendula are planted in the aisles. The smell of tomato bushes, onions and garlic is also unpleasant to her, but the aroma of bird cherry is very attractive.
Thus, to protect currants, the following actions are performed:
- careful selection of seedlings;
- treatment of cuttings with biological products before planting;
- spraying with long-acting drugs before flowering;
- treatment with preparations against butterflies at the beginning of their summer;
- timely pruning of young shoots 3 cm below the affected area;
- complete cutting of diseased and branches lying on the ground with hemp treatment by garden var;
- loosening and mulching the soil under the bush with the addition of tobacco dust.
Chemical preparations should be used in strict accordance with the instructions on the packaging and the observance of the necessary safety measures.
Why do the currant bushes dry (video)
Bushes, to scare away butterflies during the summer, it is recommended to spray tinctures of plants with a pungent odor. It can be garlic, onion peel, pine needles, orange peels, herbs with a spicy or balsamic aroma: tansy, wormwood, calendula. Sometimes in the aisles for the same purpose cans are placed with sand, which is poured with kerosene.