African violets pests, as houseplants and are divided into three categories:
In the following I present some information about each species separately.
Mites belong to the category:
– Spider mite (Tetranychus urticae);
– Paianjenul plate (Tenuipalpidae);
– Transparent spider (Tarsonemidae);
– Acarianul Parasitiformes.
Spider mite (Tetranychus urticae) is the most ubiquitous of all mites. It has a round body, yellow, vierzuie brown or covered with hairs develop quite rare but. The sides of the body may have stains darker colors. Females, hibernating in winter, may be reddish or red. Males are slightly smaller than females and have a slightly elongated body.
All representatives of this species, somehow or other, barely visible weave their cloth around the affected areas of the plant, where they and named spiders.
Eggs laid by females are round whitish or yellowish in color and have a nearly transparent. Once the embryo begins to develop, egg content becomes cloudy, and eggs are yellow.
Development of the embryo depends on the room temperature. At a temperature of 15 ° С embrionulul develops within 15 days, and at a temperature of 30 ° c only in 2-3 days.
Of eggs fertilized females out, of the unfertilized male. Spider mite larvae, Unlike adults, have three pairs of legs. After the first stage of development, the larvae turn into nymphs and have 4 pairs of legs, as adults. Life expectancy of a generation depends on temperature and is 30-35 days or 7-8 days.
Autumn most of nymphs turn into females hibernate all winter without feed. Many of them migrate to neighboring areas located either at high, be in the basement. So, precautions are taken against these mites do not always give the expected results.
During hot weather, a good deal of females cease to migrate in search of food and shelter by the end heatwave. This makes it harder and more fight these pests.
Signs of contamination and the measures taken against the harmful.
Spider mite (Tetranychus urticae) feeds on plant cell contents. Its presence is indicated by small white spots on leaves ( especially those on the lower leaf) and a woven cobwebs around the plant or certain plant parts. In case of heavy contamination, bleached leaves of multiple injuries. The plant is fully covered with a spider web, and the extremities leaves and flower buds accumulate a mass of moving bodies.
A lot of plant cells are destroyed, surface shrinks and intensity of photosynthesis, plant is becoming weaker and more exposed to infections of all kinds.
Although it feeds on plant cells, painjenul acarian (Tetranychus urticae) is the carrier of infection. The literature says that the parasite in question is a carrier of gray mold spores and viral infections of many species of crops and ornamental plants category.
No insecticide takes effect on this pest. In the fight against it is recommended to use acaricidelor or insectoacaricidelor. Unfortunately, there is no acaricide that does not endanger human health. Therefore, is very important to work with them with great attention and at regular intervals, strictly following all safety precautions listed in the safety data sheet.
The harmless acaricides, used apartments are VERMITEC, FITOVERM, NEORON, DEMITAN, MISS, SUNMITE, NISSORUN, BYE-BYE, Mitigate, etc. insecticides or acaricides: TALSTAR etc..
These products are very effective if used properly. Unfortunately, they do not make their effect on eggs and females are in hibernation, so once acaricide treatment temporarily stopped or no spider mite attack.
Preparations in question did not make effect if room temperature is below 18 ° С and if the solution prepared from these was kept for more than one day.
At a temperature of 20 ° c are required at least 3 splashes with a range of 9-10 days, and at a temperature of 30 ° c are required 3-4 splashing with an interval of 3-4 days. In caz counterrevolutionary, females emerged from the egg, reach maturity in 6-7 days at a temperature of 30 ° c and will lay eggs again.
And APOLLO acaricidul 50 SC can be used successfully in the extermination of this mite. APOLLO 50 SC ovicid very good effect, and is effective against larval stages in young to many species of mites. Excellent product action reduces the number of treatments compared with standard control programs.
But, the biggest 'manufacturers' spider mites remain to be nights where the temperature and humidity is conducive to the development of their mass.