Exempel på cocoon

• However, adult eclosion did not always occur from cocoons derived from hosts that had been parasitized at the later time points.

• Six days later the female was supplied with similar cocoons and with one not covered with strawboard.

• However, second and fourth instars were also readily attacked, together contributing almost 50% of the final number of parasitoid cocoons produced.

• Under natural conditions, most cocoons were found in the upper 1 cm of sand within a radius of 500 cm from the nest.

• The host larvae hatched, entered the apples, and when fully fed, emerged and made their cocoons.

• Therefore, a second set of parasitized cocoons was left intact until the seventh day after oviposition and then carefully opened.

• Parasitized cocoons were put into a climate chamber immediately after the female completed oviposition.

• The cocoons were transferred to ventilated plastic containers for adult emergence and mating.

• The cocoons were collected and placed in clean containers for adult emergence.

• On the other hand, the soil was less compressed in the frames than in the field, making access to host cocoons easier.

• Each generation, 150-200 cocoons were chosen at random from more than 1000 cocoons to produce adults for maintaining the culture.

• Parasitoid cocoons were weighed, the wasp development time calculated and adult emergence monitored.

• To make silk, the filaments from several cocoons are unwound and reeled together, resulting in fibres of extraordinary strength.

• All cocoons that formed from parasitized hosts were removed from the stems and kept separately in vials plugged with cotton wool.

• All individuals emerged from the same sample of cocoons.