Apple Orchard IPM
Program Development Simulation Name_______________________________
Your role: Pretend you are an apple orchard farmer in Pennsylvania. Your goal: Grow healthy apples to sell for profit $$$$$ Your problem: a pest called the European Red Mite (Panonychus ulmi)
Background: As you might expect, it is unlikely that a farmer would know everything
about every type of pest possible and the particulars about the IPM program for that pest.
Therefore, just as a farmer, you are going into this without a whole lot of knowledge
about particulars. The resources available to you on the website are exactly what is
available to the general public. (In fact, if you had just one apple tree in your yard,
theoretically you could consider that as your orchard...) Right now, you will be using this
class time to gather the information you need to decide how to deal with your pest
problem. Using the guidelines below, create a procedure for yourself in dealing with your
pest problem following IPM guidelines. Record how you will do the following to save
your orchard and protect your investment.
To Begin, read over the information at the website
Monitoring Program Outline:
1. Describe the type of damage mites do to plants and apple trees.
2. How would you calculate/determine the percent infestation of mites in your orchard?
3. If you determined infestation to be 65%, what would be the values below?
Using Table 2-3
Expected density in mites/leaf
Limits of mite populations in mites/leaf
4. What is the Procedure for Determining Action Threshold? Why is it important to
5. If the mites/leaf level was 15 mites per leaf on July 30th and you require a
productivity of 500 bushels/acre to stay in business, would you treat or not treat the
mite problem according to the action threshold graph?
6. What is Stethorus? What is its function in apple orchard management?
7. What is the basic procedure for monitoring beneficial predatory insects like
8. Why is a predatory insect to mite ratio of 2.5 so important? How is this related to
determining if chemical pesticides are needed?
9. Choose the best chemical pesticide for ERM (ERM = European Red Mite) on apples.
http://agsci.psu.edu/tfpg/part4/AGRS045-04-03.pdf/view (Use pages 209-211 to
determine which miticide works well on ERM but has no or moderate effects on its
predators). Which miticide did you choose? Why did you choose that particular
10. Goggle search your miticide to find the Materials Saftey Data Sheet (MSDS)
information on your pesticide of choice? What precautions are necessary in dealing
with exposure to your pesticide of choice?
11. Name three pesticides that would be the worst in term of negatively affecting
beneficial insects like Stenthorus?
12. Name and describe the utilization of two other predatory insect besides Stethorus.
13. What are some other pest management options/strategies for an apple orchard besides
beneficial insects and pesticides? You may want to search the Internet for this.