Importance of Insect

18330 Words74 Pages
The importance of insects Insects represent animals commonly found in different types of the environment. They adapted to extremely harsh living conditions by developing modified, and often quite complicated mouth-parts. This helps them use all kinds of available food. It is therefore not surprising, that these widespread and numerous animals significantly affect the environment in which they live. Insects are also of great importance for the economy. Some of them are our allies whereas others are grimly fought enemies. One of the most important roles insects play in the natural word is the pollination of flower plants (Phot.1). Over millions of years, the evolution of flower plants and the related insects proceeded in parallel. As a result, various tools for collecting and transporting pollen have been developed, such as ventral brushes, pollen-baskets on legs or tufts of hair on other parts of the body. Some species, for instance, have unusually long tongues which help them reach the bottom of elongated flower tubes in search of nectar. Some insects pollinate flowers blooming in the daytime while others prefer flowers that open at twilight. The most important pollinators of flower plants are hymenopterans, especially wild bees, as well as lepidopterans, dipterans and coleopterans. Numerous insect species compete for food with man, causing considerable damage to crops or consuming wild plants which are also utilized by people. The chrysomelid beetles (Chrysomelidae) feed on green plant tissue. This leads to a significant decrease in the size of yield where the beetles occur in large numbers.The most famous representative of this family is the Colorado beetle (Leptinotarsa decemlineata). Other species commonly found in the Park include the red poplar leaf-beetle (Chrysomela populi), which feeds on poplars, willows and aspen, as well as one of the spotted leaf
Open Document