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My little Dungsters are finally back!
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<blockquote data-quote="agmantoo" data-source="post: 853604" data-attributes="member: 8973"><p>From what I have read the adult dung beetles were not significantly impact by IGR. That is what the makers of the IGR products want you to believe. Read further and what you find is that it was the Progeny that is impacted. Most insects do not have long lives. It is the offspring that is important in maintaining population.</p><p></p><p>The effects of insect growth regulators (IGR), diflubenzuron and methoprene, on African dung beetle, Digitonthophagus gazella (Fabricius), a natural enemy of the horn fly, Haematobia irritans irritans (Linnaeus), was studied. Beetles were placed in buckets partially filled with humid soil and were fed bovine feces containing 1, 0.5, or 0.2ppm diflubenzuron and 0.2ppm methoprene. Insects and their progenies were recovered by pitfall traps. Diflubenzuron and methoprene did not affect the survival of the adults but reduced their progenies. Diflubenzuron 1 and 0.5ppm also affected the life cicle of the beetles. None of the IGR modified the gender ratio of the progenies. According to the IOBC criteria, diflubenzuron tested concentrations showed to be moderately harmful to the beetles, whereas methoprene 0.2ppm was slightly harmful.</p></blockquote><p></p>
[QUOTE="agmantoo, post: 853604, member: 8973"] From what I have read the adult dung beetles were not significantly impact by IGR. That is what the makers of the IGR products want you to believe. Read further and what you find is that it was the Progeny that is impacted. Most insects do not have long lives. It is the offspring that is important in maintaining population. The effects of insect growth regulators (IGR), diflubenzuron and methoprene, on African dung beetle, Digitonthophagus gazella (Fabricius), a natural enemy of the horn fly, Haematobia irritans irritans (Linnaeus), was studied. Beetles were placed in buckets partially filled with humid soil and were fed bovine feces containing 1, 0.5, or 0.2ppm diflubenzuron and 0.2ppm methoprene. Insects and their progenies were recovered by pitfall traps. Diflubenzuron and methoprene did not affect the survival of the adults but reduced their progenies. Diflubenzuron 1 and 0.5ppm also affected the life cicle of the beetles. None of the IGR modified the gender ratio of the progenies. According to the IOBC criteria, diflubenzuron tested concentrations showed to be moderately harmful to the beetles, whereas methoprene 0.2ppm was slightly harmful. [/QUOTE]
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