Estimates of economic value of a given trait differed among the varieties. Silk is used in making other natural and synthetic fibres. Shell ratio It denotes the total amount of silk available in a single cocoon and is expressed in percentage. asked Sep 11 in Trends in Economic Zoology by MeenaKumari (50.7k points) trends in economic zoology; class-11; 0 votes. Most of its silk is manufactured for clothing to Australia and New Zealand. These two countries use the geographic location to its advantage, by wholesaling it to the rim of Asia. ... Economic Importance for Humans: Positive. When they pupate, larvae of lacewings and antlions dig a small cavity in the soil and spin a loose silken cocoon around themselves. In 1989, 74 thousand tons of silk were produced (Lepidoptera Part 2 1997). Uses of silk. This largely Muslim nation has an Asian twang, when it comes to silk manufacturing and its economic effects on the country. Rearing of silk on commercial basis is called sericulture. Lacewing larvae are beneficial as predators of agricultural pests (aphids, whiteflies and scale insects). This economic trait represents the total quantity of silk in a cocoon. Economic Importance . Explain the process of cocoon formation in earthworm. Even with each cocoon yeilding one half mile of fibers, that is an astounding amount of silk (The Animal World 1990). Copulation followed by the formation of cocoon for fertilization and development are adaptations for reproduction on dry land. ECONOMIC IMPORTANCE OF EARTHWORM. Economic Importance for Humans: Positive. Importance of silk. One thread consists of up to 48 individual silk filaments. 100 The effect of ultrasound on silkworm, Bombyx mori in terms of cocoon economic parameters such as the cocoon weight and quality, pupal weight, moth weight, eclosion, andeffective rate of rearing has been examined. Dinocampus coccinellae is a braconid wasp parasite of coccinellid beetles, including the spotted lady beetle, Coleomegilla maculata. In this way the life cycle of silk moth completes in 45-50 days. Economics of Cotton. • The silk at the cocoon stage is known as raw silk. Cocoon weight, shell weight, and shell percentage had the highest economic … The impact of ultrasound is profound. Silk is used in making clothing, curtains etc. 1 answer. Post-Cocoon process: This process usually starts with the selection of the cocoon, the next step would be cooking and the final step would be silk reeling. Egg sacs are from 7 to 10 mm in diameter and contain from 168 to 365 eggs. They play an important role in agriculture and are the best friends of farmers as they are continuously ploughing and manuring the soil. The imago breaks cocoon and survives for 5-6 days. It is calculated by using the following formula. Average single shell weight was calculated from 10 shells used for the assessment of cocoon weight. A cocoon which is good will give a … Coming to the selection of cocoon, to reel the silk, this step is very much important. A National Cotton Council analysis affirms that today’s modern cotton production system provides significant benefits to rural America’s economy and environment. Earthworms are of great economic importance to man. 6. Economic values of these traits as well as their relative economic importance (REI) compared with cocoon weight were estimated. • Appearance of silkworm • Silkworms begin as wormlike larvae with the three distinct body parts of an insect. After spending time in a cocoon, the … The cocoon darkens from shiny white to dirty brown before the eggs hatch. Spiderlings ride on their mother's back until they are ready for dispersal.