100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
CRSS 3500 Quiz 2 Questions and Answers All Correct $11.49   Add to cart

Exam (elaborations)

CRSS 3500 Quiz 2 Questions and Answers All Correct

 4 views  0 purchase
  • Course
  • CRSS 3500
  • Institution
  • CRSS 3500

CRSS 3500 Quiz 2 Questions and Answers All Correct Mechanisms of antibiosis - Answer- - physical = cuticular waxes, trichomes (hairs), plant thickness - chemical = toxins, digestibility reducers Positive effects of antibiosis on natural enemies - Answer- - slows development of hosts/prey: pro...

[Show more]

Preview 2 out of 5  pages

  • October 29, 2024
  • 5
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • CRSS 3500
  • CRSS 3500
avatar-seller
Scholarsstudyguide
CRSS 3500 Quiz 2 Questions and
Answers All Correct

Mechanisms of antibiosis - Answer- - physical = cuticular waxes, trichomes (hairs), plant
thickness
- chemical = toxins, digestibility reducers

Positive effects of antibiosis on natural enemies - Answer- - slows development of
hosts/prey: prolongs exposure while small
- may reduce movement of hosts/prey: makes them easier to attack

EXAMPLES of positive effects of antibiosis - Answer- - Spined soldier bug is more
effective against Velvetbean caterpillar in resistant soybeans because prey stay small
longer
- Parasitism of aphid increases on plants with glandular trichomes, which are sticky and
slow aphid movement

Negative effects of antibiosis on natural enemies - Answer- - may make hosts/prey toxic
(reduce suitability)
- physical mechanisms may trap and kill natural enemies or allow hosts/prey to escape
attack

EXAMPLES of negative effects of antibiosis - Answer- - Increased nicotine levels in
tobacco cultivars were toxic to the parasitoid Cotesia congregata, but had much less
effect on the hornworm, leading to greater hornworm problems
- High densities of glandular trichomes on resistant potatoes trap the egg of parasitoid
Edovum puttleri

HPR and natural enemies - Answer- - may have positive and/or negative effects on
natural enemies
- can actually lead to greater pest problems, if important natural enemies are deterred
- a lot of potential to be effective together, especially with the development of target
transgenics

Insecticide History - Answer- 1946: first report of resistance to DDT
1950s&1960s: widespread resistance to DDT and related products
1965: first Carbamates
1972: first B.t. (HD-1)
1973-75: first pyrethroids

, Classification of Insecticides - Answer- - inorganic compounds
- organic compounds (carbon-based)

Inorganic compounds - Answer- - first products used as insecticides
- minimal use today (sulfur as a miticide & cryolite for chewing insects)

Organic compounds - Answer- - oils and soaps: primarily physical action, potential for
phytotoxicity, insecticidal soap
- botanicals: pyrethrum, nicotine, rotenone, neem
- microbial: bacillus thuringiensis (used on mosquitos), entomopathogens (NPV)

General MOA EXAMPLES - Answer- - nervous system
- growth regulators
- feeding inhibition
- metabolic processes
- nerve and muscle action

Insect Growth - Answer- - exoskeleton = prevents dehydration, periodically shed for
growth and development

Speed of Activity - Answer- - nerve toxins are fastest
- growth regulators generally active at next molt (mortality is generally slow)
- interference with metabolic processes generally slow death
- disruption of midgut (slow death)
- feeding blockers (slow death)

T/F - European honeybees (which are not native) are in danger - Answer- FALSE -
European honeybees are not in danger

T/F - Native pollinators are most at risk and most important to us - Answer- TRUE

Neonicotinoid insecticides DEFINITION - Answer- - group of insecticides with a
chemical structure that is similar to nicotine
- nerve poison that affects the nicotinic acetylcholine receptor

Chronic / Sub-Lethal = ? - Answer- long term affects

Acute = ? - Answer- die on the spot

Two basic types of application - Answer- 1. Liquid Spray: easier to calibrate, very
precise, subject to drift and runoff
2. Broadcast granules: less precise, little residue on flowers/foliage, no drift bit it can
runoff

Best Management Practices of Landscape - Answer- - apply pesticide only when
needed

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller Scholarsstudyguide. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $11.49. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

62890 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling
$11.49
  • (0)
  Add to cart