Question

why weeds and wild plants are not affected by insects and pests ?

Answer 1

because they also posses toxic material which kill the insects poisonous.

Answer 2

Weeds and wild plants are not affected by insects and pests because:

• They are, is the straightforward response. Native plants that are frequently seen as weeds are crucial sources of nectar and larval hosts for insects.
• For the monarch caterpillar, milkweed is its sole food supply, while clover is one of the primary early-season nectar sources for bees. They are ubiquitous, numerous, and well adapted to their natural environment, which accounts for why they appear unharmed.
• There is enough of the plant to go around, and it has had thousands or millions of years to evolve defences against the most voracious herbivores, so each individual plant will probably escape with only a few nibbles.
• However, most of the plants and crops we use for our landscapes are non-native and not as well adapted.
• Additionally, especially in tiny gardens, there might only be one or two of each sort of plant, so if a specific insect happens to prefer it, there are only one or two plants available, making it more likely to be eaten down to the ground.
• A "monoculture" is produced when a single crop is grown in huge farms' entirety. Because there is just one type of plant available to eat in monocultures, pests are not diverted by other potential food sources and plough through the agricultural field, reproducing quickly as they go.

Hence, the reasons behind weeds and wild plants are not affected by insects and pests

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