Sometimes there is no more effective means of controlling an agricultural pest than giving free rein to its natural predators.
Central Topic
Controlling unwanted crop pests with natural predators vs. pesticides
Framework
Theme / Example
Main Point
Sometimes you'd get better results managing a crop pest population with a natural predator than with a pesticide, as is the case with cyclamen mites and their predator, Typhlodromus.
Passage Map
(P1) General idea. Introduction to specific example -- Sometimes letting natural predator control a crop pest is the best way. A case in point is cyclamen/tyhplo. (P2) Reasons typhlo is an effective way to control cyclamen (P3) Experimental support for effectiveness of typhlo (P4) Practical, in the field, support for effectiveness of typhlo
Other Commentary
On physical science passages that have visually challenging terms (like cyclamen, typhlodromus, parathion), it is very helpful for understanding and retention to re-brand those in much simpler terms.
As we pause to self-summarize, we want to be saying things like,
The second sentence of the passage reveals the purpose / main point of the passage, with the rhetorical phrase a case in point.
Just like when we see "for example", when we see "a case in point" we are becoming aware that the author cares enough about the previous idea to try to support it and flesh it out.
When you find a framing idea that the author wants to support, you should pause and re-read that framing idea until you've self-summarized it in easy language that you can understand and remember.