Not sure but I think, it might be a moth larva known as a cutworm. There are several species of Moth whose larva specialise in eating stems and roots rather than leaves and shoots They can hollow out the stem of plants and cause them to collapse . They tend to be bigger and paler than most caterpillars
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They can hollow out the stem of plants and cause them to collapse . They tend to be bigger and paler than most caterpillars