DENDROLOGY

Detailed explanation-1: -Insects may feed on leaves, stems, roots, and flowers of plants. The chewing insects actually consume the infested parts. Types of leaf feeding by chewing insects include pit feeding on leaves by leaf beetles, flea beetles, and young caterpillars.

Detailed explanation-2: -The piercing-sucking action of insects can make the leaf crinkle and curl around the insect, thus providing shelter (crinkled leaf). Sometimes, if eggs are laid into the tissue of a leaf, the affected area starts to grow abnormally like a tumour. Those structures are called leaf or petiole galls.

Detailed explanation-3: -(i) They can directly attack and cut the root, stem, and leaf of the plants. (ii) They can suck on the cell-sap from various parts of the whole plant. (iii) They sometimes even bore into the stem and fruits of the plant. This way they can affect the health of the crop and reduce yields.

Detailed explanation-4: -cast skins (translucent or whitish): aphids, leafhoppers, lace bugs, spider mites. dark fecal specks: lace bugs, leafminer adults, plant bugs, shore fly adults, thrips. More items