Invasive hornworms damage tomato gardens in Ontario

Invasive hornworms are devouring tomato plants in backyard gardens across Ontario [1, 2].

The infestation threatens local food production for home gardeners by destroying the foliage and fruit necessary for a successful harvest [1, 2].

Reports from the Greater Toronto Area and the Hamilton region indicate that the pests are feeding on tomato leaves, stems, and fruit [1, 2]. The damage can quickly strip a plant of its greenery, leaving the remaining structure vulnerable and reducing the overall yield of the garden [1, 2].

Gardeners have noted the distinct appearance of the pests and the damage they leave behind. One gardener said the sight was "miniature brown pineapples or grenades" ^[2].

While the pests target tomato plants specifically, their presence in residential backyards suggests a widespread issue across the province's southern regions [1, 2]. Local gardeners are encouraged to monitor their plants for signs of leaf loss or the presence of large caterpillars to prevent further spread [1, 2].

Because these insects feed on the primary structures of the plant, the impact is not limited to the fruit alone. The destruction of stems and leaves hinders the plant's ability to photosynthesize, which can lead to the death of the entire plant if the infestation is not managed [1, 2].