Docsity
Log inSign up
Docsity
Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity

Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan

Guidelines and tips
Guidelines and tips
Sell on Docsity
Sell on Docsity
Log inSign up

Prepare for your exams

Study with the several resources on Docsity

Find documents

Prepare for your exams with the study notes shared by other students like you on Docsity

Search Store documents

The best documents sold by students who completed their studies

Search through all study resources
Docsity AINEW

Summarize your documents, ask them questions, convert them into quizzes and concept maps

Explore questions

Clear up your doubts by reading the answers to questions asked by your fellow students

Earn points to download

Earn points by helping other students or get them with a premium plan

Share documents
download point icon20 Points

For each uploaded document

Answer questions
download point icon5 Points

For each given answer (max 1 per day)

All the ways to get free points
Get points immediately

Choose a premium plan with all the points you need

Study Opportunities

Choose your next study program

Get in touch with the best universities in the world. Search through thousands of universities and official partners

Community

Ask the community

Ask the community for help and clear up your study doubts

University Rankings

Discover the best universities in your country according to Docsity users

Free resources

Our save-the-student-ebooks!

Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors

From our blog

Exams and Study
Go to the blog

Resurgence - Integrated Pest Management - Lecture Slides, Slides of Pest Management

The LNM Institute of Information TechnologyPest Management

Main topics of this course are: Biocontrol Approaches, Decision Making, Disadvantages of Cultural Controls, EBPM Status, Enforced Crop Production Rules, Hybrid Sterility, IPM Evolution Continued, Regulatory Tactics, Resistance Categories. Key points of this lecture slides are: Resurgence, Pesticide, Pest Resurgence, Reduced Biological Control, Resistance, Resistant Mechanism, Resistance Process, Management Strategy, Impact of Resistance, Environmental Impact

Typology: Slides

2012/2013

Uploaded on 08/31/2013

jaee
jaee 🇮🇳

4.7

(22)

101 documents

1 / 22

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
Resurgence
•Mostly documented with insect pests
•Mostly associated with indirect, secondary/minor
pests for several reasons.
–Key pests are watched too closely to resurge
–Direct pests are mainly late-season pests & there isn’t
time to resurge
–Pest must be held at least partially in check by some
agent that is affected by the pesticide
•Note Fig. 12-6 in book.
pf3
pf4
pf5
pf8
pf9
pfa
pfd
pfe
pff
pf12
pf13
pf14
pf15
pf16

Partial preview of the text

Download Resurgence - Integrated Pest Management - Lecture Slides and more Slides Pest Management in PDF only on Docsity!

Resurgence

  • Mostly documented with insect pests
  • Mostly associated with indirect, secondary/minor

pests for several reasons.

  • Key pests are watched too closely to resurge
  • Direct pests are mainly late-season pests & there isn’t time to resurge
  • Pest must be held at least partially in check by some agent that is affected by the pesticide
  • Note Fig. 12-6 in book.

Pest Resurgence

Pest (8)

Natural Enemy

Pest Resurgence

pest

pest

Pest Resurgence

Note: 14 pests/leaf

Resistance

  • Mostly a problem with pesticides (so far)

but applies to all management tactics. Ex:

  • Biological Control – Rabbits & virus, Bt
  • Cultural Control – corn rootworms & rotation
  • Host Plant Resistance – many examples
  • Most serious, general problem in IPM
  • Arises because all management actions

are selection pressures

  • Problem is rapidly getting worse

Resistance is best understood as a process

Initially, a small proportion of population has a resistant mechanism by chance.

The Resistance Process

These individuals survive at a higher rate than others

Resistance as a process

Eventually, the pesticide or other management tactic causes too little control to be effective.

The process has three general stages, each

with its own Management Strategy

Prevention

Abandon Pesticide/Management Tactic

Need to monitor resistance

Causes of Resistance

Independent of Pesticide

  1. Genetic Factors
  2. Ecological Factors
  3. Severity of Selective Pressure

1. Genetic Causes of Resistance

  • Genetic Factors
    • Relative dominance – More dominant is bad
    • Linkage to phenotype – Fewer genes is bad
    • Initial resistant pop – Prior exposure
    • Broad diversity & diversity-maintenance
      • Low diversity associated with foreign pests
      • Sexual reproduction
      • Haplo-diploidy

3. Selection Pressure

  • Selective pressure is “high” if a “low” percentage

of susceptibles survive to reproduce

  • Reduce pressure by: (1) reduce dosage & (2) reduce frequency
  • Site of action
  • Alternating modes of action reduces pressure
  • Spatial coverage – reduce pressure by reducing

coverage

  • Timing – Using pesticides after reproduction

reduces selective pressure

Resistance Categories

  • Resistance to individual pesticides
    1. Delayed entrance of toxicant
    2. Increased deactivation/decreased activation
    3. Decreased sensitivity
    4. Behavioral avoidance
  • Resistance to multiple pesticides
    1. Cross-resistance & class resistance
    2. Multiple resistance
    3. Multiplicate resistance