Biorational

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Biorational Pesticides
Fire-bugs
Super-numerary extra larval stage
Juvenile hormone
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Biorationals

• Pheromones
• Airborne
• Communicate, excite, alter behavior
• Eg. grandlure, disparlure ( synth. sex
  pheromones)

• Uses
• Trapping, IPM, Research
• Confuse mate seeking males

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2. Insect Growth Regulators
Insect hormones and development
Juvenile hormone JH mimics
JH
Ecdysone
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Juvenile hormone JH mimics methoprene-
skeeters precor flea collars hydroprene
cockroach birth control
Slow acting
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• Anti-JHs
• Precocene (from Ageratum)
• Destroys Corpus allatum
• Causes precocious metamorphosis
• Allatostatin
• Brain peptide
• Inhibits CA (molting reproduction)

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• Ecdysone
• Molting hormone
• Neem oil
• Azadhiractin
• Blocks ecdysone
• Feeding deterrent
• Affects 200 insect spp.

• Chitin synthesis inhibitor
• Diflubenzurion (Dimilin)
• 1982- gypsy moth
• Larval cuticle ruptures

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• 3. Microbials
• Bacillus thuringiensis (Bt, Dipel)
• Spores
• Delta endotoxin
• Crystalline protein
• Paralyzes gut
• Pierces gut lining
• Species specific strains

Resistance??
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Promise of new pesticides?
The bugs bat last!!