Self-paced
P1
Sometimes there is no more effective means of controlling an agricultural pest than giving free rein to its natural predators. █ ████ ██ █████ ██ ███ ████████ █████ █ ████ █████ ██████████ ███ ██ ███████████ ██████████ ██ █ █████████ ████ ██ ███ █████ █████████████ ███
Intro topic ·
Controlling cyclamen mites using Typhlodromus mites
Problem ·
Infestation of strawberry plants by cyclamen mites
Solution ·
Typhlodromus mites
Attack in second year of infestation, when cyclamen mite populations reach damaging levels
P2
████████████ ████ ███ █████████████ ██ █ ████████ ██ ███████ ███████ ██ ████████ ██ ███ █████████ █████████ ███
Introduce explanation ·
Several reasons why Typhlodromus is a good solution
Reason 1: Voracious appetite
Reason 2 ·
Typhlodromus population grows as quickly a cyclamen's
Both reproduce by parthenogenesis
Reasons 3 and 4 ·
Reproductive timing and alternative sources of food
Reason 3: Typhlodromus only reproduces when cyclamen prey is available.
Reason 4: Typhlodromus has other food sources, allowing it to survive when cyclamen mites are scarce.
Draw similarity ·
Typhlodromus is similar to other predators that control prey
Because of reasons 1-4
P3
██████████ ███████████ ████ ████████ ███ ██████████ ██ ████████████ █████████ ███ ███████ ████████ █████ ██ ██████ ███ █████ ██ ██████████ ██████ ███ ███████ ████ ████ ████████ ███ ████ ██████ █ ██████ █████ ███ ████ █████████████ ██ ███████ ███████████ ██ ██████████ ██ ███████████ ████ █████ ███ █████████ ███████ ███ ████ ███ ██████ ███ ████████ █████ ██████████ ███ ██████ ███████████ ██ ████████ █████ ████████ ███ ██ █████ ██████ ████ █████████████ ███ █████ ███████████ ████████ █████████████ ████████ ███████████ ██ █████████████ ███████
Support solution ·
Experiments correlate presence of Typhlodromus with lower cyclamen populations
P4
████████ █████████ ██ ████ ████████ ██ █ █████ ████ ██ █████ █████ █ █████████ █████ ██ ███ ████ ████ ████ ████ ██ ██ ████████████ ███████████ ███
Implications of experiment ·
Pesticide use can cause more harm than good...
...if pesticides kill predators like Typhlodromus
Reinforce implications ·
Where pesticide (parathion) used, Typhlodromus absent and cyclamen populations higher
Again, correlation between presence of Typhlodromus and lower cyclamen populations
Passage Style
Problem-analysis
Single position
23.
Suppose that pesticide X drastically █████ ███ ████████████ ████ ██ ████████ █████ ███ ███ ██ █████ ██████ ██████ ██ ████████ █████ ██ █████████████ █████ ██ ███ ███████████ ██ ███ ████████ █████ ███ ██ ███ █████████ █████ ████ ██████ ████ ████████ ███ ██ ███ ███████████ █████████ ██ ███ ████████ █████████ █ ███ ████ ████ ███████ ██ ██████████ ████ ███ █████ ██████████ █████████ ███ ███████████ █████████ ███ █████
a
In both treated ███ █████████ █████ █████████ ██ ████ ████████████ ███ ████████ ██████ ███ ██████ █████ ████ ████ ███████████ ███████████
Supported, because in P3, the author tells us that plots that still had T-mites controlled C-mites more effectively than plots in which T-mites were killed. If, as the question stem asks, we use a pesticide that slows C-mite reproduction and doesn’t kill T-mites, then T-mites would exist in every group of plants. So C-mites would be controlled everywhere.
b
Cyclamen mite populations ██ ███ ███████ █████ ████ █████ ████████████ ███ ██████ █████ ████ ████ █████████████ █████ ████ ██ █████████ █████ █████████ ██ ████ █████ ██ ██████
Not supported, because if T-mites aren’t in a plot, C-mites aren’t as effectively controlled compared ot when T-mites are present. So we’d expect more C-mites in plots without T-mites.
c
In the treated ██████ ██████ ████████████ ██ ████████ █████ █████ ████ ███ ██ █ ████ ██ ████████████ █████████ ███████ ████████████ ███ ████████ ██████
Not supported, because the synchrony would still exist. If C-mites populations are low, then T-mite populations would remain low. That’s still synchrony, even if C-mite populations never get higher.
d
In the treated ██████ ████████████ ███████████ █████ ████ █████████ ███████████ ███ █████ ████ ██████████ ██████████
Not supported, because if C-mite reproduction is slowed in the treated plots, we have no reason to think T-mite population would eventually increase. The population would remain synchronous with the C-mite population.
e
In the treated ██████ ████████ ████ ███████████ █████ ████ ███████ █████████████ ████████ ██████ ████ ███████ ███ █████ ████ ████████ ██ █████ ██████ ███████ ████ ██ █████████ ██████
Not supported, because in the treated plots, if the pesticide doesn’t kill T-mites, then the T-mites would keep the C-mites under control.