The watermelon seedlings were bitten off from the base of the stem by insects in the seedbed, and some cotyledons were also bitten off. They should be cutworms or golden needle worms. Grubs are generally bitten off from underground parts. After the mole crickets are bitten off, the cross-section is tangled. If you dig it carefully The nutrient soil will find bugs.
These underground pests can be irrigated with phoxim or abamectin or chlorpyrifos. The fields in the south are very humid. Observe whether there are slugs. If so, use quicklime or acetaldehyde to prevent them.
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