The need to manage insect pests has always been a key component in agricultural production systems. At the beginning of the twenty-first century, different strategies for pest management coexist and are sometime perceived as contradictory by the industry, farmers and consumers. On one hand, low-input and organic farmers base their pest management programmes on the integration of a series of [...]
Here is an essay on ‘Watershed Management’ for class 8, 9, 10, 11 and 12. Find paragraphs, long and short essays on ‘Watershed Management’ especially written for school and college students. Essay on Watershed Management Essay # 1. Meaning of Watershed Management: Watershed means an area of land whose runoff drains to a common point i.e. in the river or [...]
The idea of controlling insects by sterilising technique was first conceived by E.F. Knipling as far back as 1937 in a laboratory in Texas, USA. While studying the biology of the screwworm fly, Cochliomyia hominivorax (Coquerel), he observed that the female fly mated only once (monogamous). From this, he argued that if the males of this fly could somehow be [...]