ENTM 340 Insect Pests of Trees Turf and Ornamentals�

C. Sadof� Purdue University

Laboratory 11.� Turf IPM- Estimating the Costs of Grub Control

Turf Pest Management

A.� Principles.

B.� Estimating Costs of Scouting in Field with Cup cutters.

C.� Calculations

A. Principles:

1.� Discussion IPM principles as applied to turf.� Recall components of an IPM program.

Monitor

Record Keeping

Decision Making

Implementation

Evaluation

2� Why adopt an IPM process if applying a blanket application of pesticides will control the problem?

3.�� What are the costs associated with application?

Indirect Costs�������������������������������������������������������������� Direct Costs����������������

4. How much does it cost to treat an 18 hole golf course?

5. Research indicates that only 5% of a golf course needs to be treated in a given year.� How much money can you save if you only treat a fraction of the course?

% treated�������������������������������� Cost���������������������������������������� Savings

100

50

20

10

5

6. How do you determine which 5% to treat?

7. Research indicates that sampling on a 15yd (45 ft) grid is sufficient to ID areas needed to find hot spots.��� How much does it cost to sample an 18 hole golf course on a 15 yard grid? Hint 1 acre= 43560 sq ft.��� sqrt of 43560=208.

a. How many samples does it take� to sample an 18 hole golf course?

18 * 25 samples = 450

b.� How much does it cost to sample?

B. Sampling Costs

Equipment

����������� Cup cutter ( $100)

����������� Bucket

Core Sampling demonstration:

Team Sampling activity in the Ag Mall to determine time it takes to sample a golf course.

�Break up into teams to estimate the time to Teams, 3 buckets, 3 watches. Each team will take a transect 45 ft apart.�� Data will be recorded to estimate population.� Time will be recorded to estimate costs.

Record the time it takes to sample 5 cores 45 ft apart, to estimate average. .�

�

Team (transect) ���������� A�������� B��������� C��������

Sample # �������� 1

����������������������� 2

����������������������� 3

����������������������� 4

����������������������� 5

�����������

����������� Grub Total

����������� Time Total� ______����������������������������� Time /sample _______________

Which samples require treatment?��

12 cup cutters per square foot.

�Threshold is 11-15 / sq ft , or 1 /cutter

How much time does it take to sample

What are the labor costs pay someone to scout ?

What is net savings if you have to treat 50%, 25%, 10%, 5%...

% of area treated��������� Pesticicide Cost����������������������� Scouting Cost�������������� Savings

100

50

20

10

5