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The primary symptom is root decay, where the roots turn brown, decompose, and lose their ability to absorb water and nutrients effectively. This damage to the root system causes the plant to weaken over time. Above ground, the leaves begin to wilt, turn yellow, and eventually fall off, reflecting the plant's declining health.
Some grubs pack a triple whammy. They infest plant roots. Predators shred the lawn for grubs. And those that become Japanese beetles ravage plants.
Hormone weed sprays (e.g. 2,4-D and 2,4,5-T) may cause grotesque new growth with thin twisted leaves and distorted buds. Plants may die in severe cases. Pre-emergent herbicides contacting the plants' root system via the soil will cause yellowing foliage. Effects of soil borne herbicide may take several years to clear.
However, white grubs (reaching 40–45 mm long when full grown) live in the soil and feed on plant roots, especially those of grasses and cereals, and are occasional pests in pastures, nurseries, gardens, and golf courses. An obvious indication of infestation is the presence of birds, such as crows, peeling back the grass to get to the grubs.
Armillaria root rot is a fungal root rot caused by several different members of the genus Armillaria. The symptoms are variable depending on the host infected, ranging from stunted leaves to chlorotic needles and dieback of twigs and branches. However, all infected hosts display symptoms characteristic of being infected by a white rotting ...
[6] [7] [8] In Sri Lanka, grubs have been observed to feed on the tap roots of the teak seedlings, and finally the damaged plants wilt and die. [9] Grubs also can be removed from the cultivation land by cultural practises such as ploughing, harrowing, hoeing, flooding and fallowing of fields, trap cropping and crop rotation.
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Highly infected bulbs can also split apart or show malformed bloating. The leaves of the plant become flaccid and may collapse. This can lead to defoliated plants. [19] Garlic shows similar symptoms of leaf yellowing and stunted bulbs. [20] When harvested, the infected garlic may be missing portions of the root system. [19]