Collenchyma cells

Collenchyma cells are generally elongated cells that have thicker primary walls than parenchyma cells,

Collenchyma cells provide flexible support without restraining growth

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Cell-content feeders, such as mites and thrips, are piercing-and-sucking insects that cause an intermediate amount of physical damage to plant cells.

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Chewing insects, such as caterpillars, grasshoppers, and beetles, cause the most significant damage to plants. 

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Plant viruses are biotrophs and they enters in the plants via plasmodesmata and phloem

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Plant viruses have small genomes; most encode only three to 10 proteins.

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Viruses targets endocytic recycling pathway for cell‐to‐cell spread

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Many insect pest species also transmit viruses. The sapsucking species are effective virus vectors, delivering virus particles directly into the vascular tissue, thereby permitting their rapid dissemination throughout the plant