Thick, cream-coloured caterpillars tunnel inside squash stems, leaving holes and piles of sawdust-like frass near the base. Vines may suddenly wilt and collapse even when the soil is moist.

Flat, dark grey-brown bugs that gather on squash plants and suck sap from leaves and stems, causing yellow spots, wilting and eventually brown, dead foliage.

Dark, water-soaked lesions develop on stems, roots or fruit, often followed by sudden wilting and plant collapse.

Small white maggots tunnel into onion roots and bulbs, causing seedlings to wilt or die and older bulbs to become soft, damaged and prone to rot.

Small white larvae feed on corn roots underground, causing stunting, poor anchoring and sometimes bent or “goosenecked” plants.

Small white maggots that tunnel into roots, causing brown scars, rot, wilting and poor growth.

Dark lesions spread up the stems, weakening plants and causing yellowing, wilting and eventual collapse.

Swollen, distorted roots interfere with water and nutrients, leaving plants stunted, yellow and prone to wilting.

Yellow V-shaped patches spread inward from leaf edges as veins darken, leaving plants wilted, stunted and damaged.

White fluffy growth, soft rot and wilting — often followed by the plant collapsing.

Leaves suddenly wilt and collapse, often while still green, as bacteria block the plant’s water supply.

Early symptom is leaves begin turning yellow and brown at the margins, called "firing"

Lower leaves turn yellow and droop, often on one side only