Sometimes cow capricious, refuse to eat, quite tolerable, from our point of view. Here is a short story about the eccentric ladybug rodolia, famous for the fact that she had saved citrus plantations in the country and abroad, when the trees were attacked by a terrible pest accidentally introduced from Australia,grooved mealybug. This mealybug was not afraid even of such a poison, as hydrocyanic acid.
After making sure that the chemicals would rather kill trees than destroy pests, decided to resort to the services of rodolia, which in Australia for centuries fought with malicious mealybug. However, we were not brought indigenous inhabitants, and rodolia emigrants who lived in Africa. Small predator rode with all amenities in the stateroom, where the tubs were lemon trees. The trees were infested with lunch - scale. On this pasture land and grazed cow, and to herd ran, the trees enveloped the finest network. Insects safely moved to a new place of residence, where at first they settled in greenhouses. And then increased the herd was released on the black sea coast of the Caucasus.
Larvae of rodolia feasted full - destroyed and adults of mealy bugs and their eggs. And suddenly, near Sukhumi shrew bugs, changed the url - moved with citrus Spanish gorse. And here is the result: scale insects living on the gorse, do not suit Ladybird - yesterday gluttons prefer to die of hunger.
Meanwhile, the solar calves enviable appetite - in each day have fifty aphids. Do not complain about lack of appetite and larvae of ladybirds: for their full development requires about a thousand aphids. To satisfy his hunger, larvae sometimes eating caterpillars.
However, menus, adult beetles can sometimes vary. For example, in Japan, where aphids cause considerable damage to fields and orchards, the ladybugs are grown in the laboratory and then released into the wild. Insects in the laboratory cherished. And even not fed aphids, and high-calorie larvae of bees. The ladybugs do not remain in debt - they began to give in the year two thousand descendants (usually lay 200 to 400 eggs).
Our entomologists also find ways to spur the appetite and fertility of ladybugs. So, Professor centuries Yakhontov crossed seven insects from the vicinity of Tashkent and from the Volga region. After crossing the fertility of bugs has increased by half, and the appetite to 47.3% in comparison with the most insatiable ancestors. Unfortunately, so far failed to convince bugs to do with procreation all year round.
In the United States in the fifties began to flourish firm, zagotavlivaetsya for the future of ladybugs. Sleeping insects, living somewhere in the mountains, were placed in canvas bags nine kilograms (about 80,000) and kept until the time at 4-6° heat. In the summer the farmers, who did not want to resort to pesticides, bought cows (6-8 dollars per kilogram) and was declared a biological war agricultural pests. Only growers of Washington in 1946 thrown into battle five solar tons of bugs.