2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
Currant (or currant) glass pan, in addition to all types of currants, often damages gooseberries, raspberries, hornbeams, hazel and euonymus. In most cases, the damage caused by it first leads to wilting of the leaves, and after a while the shoots completely die. At the stage of berry ripening, damaged shoots are especially noticeable. It was also noted that most often currant glassware affects currant varieties prone to cracking of the shoot bark
Meet the pest
The currant glass bowl is a butterfly with a glassy wing span of 23 to 25 mm. On the outer edges of the front wings, you can see rather bizarre orange edges. The entire body of the pests is covered with bluish-black scales, and the antennae from above are blackish. Females have three yellow stripes on their abdomens, and males have four yellow stripes. And the very tops of the abdomens are decorated with tassels formed by bluish-black hairs.
The oval yellowish eggs of the currant glass jar are quite shiny. White caterpillars, reaching a length of 20 - 25 mm, are endowed with double-separated occipital scutes, brownish-brownish heads and yellowish anal and thoracic scutes.
Overwintering of voracious caterpillars takes place mainly inside shoots, and caterpillars of the last instars usually overwinter in perennial twigs, and young caterpillars in annual shoots. At the green cone stage, these parasites begin to feed, first gnawing out the middle of the tiny shoots, and a little later down to their bases.
Caterpillars pupate approximately in May - they pupate at the ends of the passages, having previously made numerous ejection holes in them. Butterflies fly out ten to fifteen days later. In June, flower nectar serves as their additional food. Eggs are laid by females one at a time at the bases of the buds, in the cracks of the shoot bark, or in various wounds on the bushes. The total fertility of females reaches forty to fifty eggs. Caterpillars hatched ten to twelve days later, through mechanical damage, make their way into the shoots. Sometimes they can penetrate into them and through the bark of healthy shoots. Caterpillars that have reached their last age by the fall have time to complete their development in a year, and individuals who do not have time to do this have to go through two wintering periods, since their development is characterized by a two-year cycle.
How to fight
First of all, for cultivation, it is recommended to select currant varieties that are resistant to lesions with currant glass. When caring for berries, it is necessary to avoid any mechanical damage to the shoot bark. All weakened by pests, as well as the currant shoots inhabited by them, should be cut and burned immediately before flowering. No less important is the fight against weeds on the site - their timely destruction deprives the gluttonous parasites of additional nutrition, thereby reducing their fertility.
Every fifteen to twenty days it is necessary to inspect the currant bushes (it is especially important to do this during its flowering period) - dried and fading branches must be removed, and when they are removed, the healthy part should also be slightly captured (below drying by 4-5 cm).
On warm days from October to February, the thin twigs are gently bent in the middle. Branches affected by currant glass will surely break - they need to be cut out to healthy areas of wood with no back doors going down.
The caterpillars of the currant goblet have natural enemies - they are often infected by braconids and other predators. And as a means of repelling these pests, a small amount of nasturtiums, calendula, garlic, onions, marigolds or tomatoes is planted in the aisles of berry bushes. Will scare away currant glass and the smell of elderberry. But the scent of bird cherry is quite attractive to these parasites.
They switch to spraying with insecticides if about five percent of damaged shoots are found on old plantings, and about three percent on young ones. Mostly insecticides are used at the larval revival stage. As a rule, two sprays are carried out: the first - ten to twelve days after flowering ends, and the second - as soon as the crop is harvested.
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