2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
The raspberry weevil is not only the enemy of raspberries, strawberries, blackberries, but also rose hips with roses. You can meet these parasites everywhere, but they are especially abundant in the forest-steppe, as well as in woodland. And if you do not start to fight them in a timely manner, you can lose a pretty decent part of the harvest
About the raspberry weevil
Raspberry weevils are oval beetles 2 to 3 mm long. Their color is black, with a slight brownish tint. Pests are covered with light gray thin hairs and endowed with thin long legs.
The eggs of the enemies of raspberries are white, 0.35 - 0.5 mm in size. Their larvae are sickle-curved, also white, with yellow-brown heads, about 3.5 mm in length. The size of the pupae reaches 2, 5 - 3 mm, from white they are gradually transformed into yellow-brown.
Wintering of immature individuals takes place under fallen leaves, in the surface layer of the soil. They leave their wintering grounds in late April or early May, as soon as the temperature exceeds 13 degrees (strawberries begin to grow at the same time).
Initially, the parasites feed on the leaves, in which they gnaw out many holes, after which they move to the buds and begin to eat away their contents. In the holes (one in each), females, whose fertility is about 50 eggs, lay eggs; females gnaw the pedicels and cover the eggs with their excrement. From eggs 6 - 7 days later, harmful larvae revive, devouring only the contents of the buds for 20 - 25 days (and here pupate at the end of their development). 7 - 9 days later, beetles begin to appear (approximately in July, in the second half of it) and begin additional feeding on raspberry leaves.
When the air temperature drops to 10 - 12 degrees with the onset of September, harmful beetles go to winter in the litter and topsoil.
How to get rid of the parasite
Raspberry weevil larvae serve as food for predatory bugs, hoverfly larvae and ground beetles. And the larvae are infected by braconids.
When protecting against pests, it is very important to collect plant residues with fallen leaves and then burn them. The soil is cultivated not only in autumn, but also in early spring. Mowing strawberries at the end of the harvest will also lead to the death of a certain part of the raspberry pest if these berry crops grow nearby.
When planting berry crops, it is also important to know that it is not recommended to plant strawberries next to raspberries, because they have common pests.
Spraying with an infusion of capsicum or a solution of potassium permanganate (10 liters of water - 5 g) create very good conditions for scaring away beetles. You can use infusions of wormwood and tansy.
A solution of mustard powder diluted in three liters of warm water is also used. An infusion of wood ash is considered an equally effective remedy: 3 kg of ash and laundry soap (40 g) are taken for 10 liters of water. The bushes are sprayed with this infusion during budding.
Experienced gardeners are also advised to try the following solution: in 10 liters of water, first dilute ammonia (2 tablespoons), and then iodine (1 teaspoon). The bushes are treated with the first solution in early spring, as soon as young leaves appear, and with the second, two weeks later.
If there are 3 - 4 beetles per bush, insecticides are used: on raspberries they are used at the stage of exposing the buds, and on strawberries - at the very beginning of their regrowth. Spraying with corsair, actellik, vofatox, ambush, metaphos, gardona, etc. is carried out. It should be carried out no later than five days before the start of flowering bushes. The processing of raspberries before flowering, as well as after harvesting with fufanon or karbofos, also helps.
Biological preparations have also proven themselves quite well in the fight against the raspberry weevil (fitoverm, acarin, spark-bio) - plants should be treated with them at the very beginning of May.
A mechanical method of fighting this parasite is also used: films or other material are spread on the ground, on which crimson weevils are shaken off. The collected beetles must then be destroyed. The procedure is carried out, as a rule, before the first inflorescences come out, as well as at the end of the berry picking in the second half of August (against young pests). The morning time will be ideal for its conduct - parasites in the morning are distinguished by inactivity.
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