How do lodgepole pine trees naturally defend themselves against the beetle? Biology Plants Plant Defense 1 Answer Oliver · [eden] May 19, 2017 It used to be the harsh winters with weeks below #0# Fahrenheit, now they no longer have that defence because we have not had a winter with more than #6# days below #0# Fahrenheit at a time in #12# years. Explanation: See answer: Answer link Related questions What are plant defenses? How do plants use chemical defenses? What are some examples of plant chemical defenses? What are some examples of plant mechanical defenses? What is the green world hypothesis? What are the different defense mechanisms in plants and animals? How would you define physical defense of plants? Question #9d84b Why can red algae live in deeper water than green algae? A plant's cell wall is made of cellulose fibers. What is the purpose of a plant's cell wall? See all questions in Plant Defense Impact of this question 2644 views around the world You can reuse this answer Creative Commons License