What Kills Canna Leaf Rollers: Effective Solutions

When it comes to effectively managing leaf rollers, choosing the right pesticide is crucial. One recommended option is Bacillus thuringiensis (Bt), a natural bacterium-based solution. Bt is particularly effective against leafroller larvae, which are the juvenile forms of butterflies and moths. It specifically targets caterpillars, making it a precise choice for controlling leaf rollers without harming other beneficial insects. To maximize its effectiveness, it’s important to apply Bt as a foliar spray at the correct time. Initially, a properly timed foliar spray of Bt or spinosad can be used to tackle leafroller infestations. However, it’s worth noting that Bt has a relatively short persistence, so a second application is recommended approximately 7 to 10 days after the first treatment to ensure comprehensive control of leaf rollers. This strategic approach can help maintain healthy foliage and protect your plants from the damaging effects of these pests.

Melinda is puzzled by the sight of neatly aligned holes on her canna leaves and wonders what is causing this damage. The distinctive pattern of these holes is a telltale sign of an infestation by canna leaf rollers, which are actually the larval stage of the Brazilian skipper moth. Typically, these pests are more commonly found in southern regions, so their presence on canna plants in Ohio is unexpected. The Brazilian skipper moths deposit their eggs within the yet-to-unfurl leaves of the canna, giving rise to the destructive caterpillars responsible for the distinctive damage pattern.

Canna plants face a significant issue related to viral infections, primarily involving three viruses: Canna yellow mottle virus (CaYMV), Bean yellow mosaic virus (BYMV), and Canna yellow streak virus (CaYSV). These plant viruses are particularly problematic in the United Kingdom, leading to various detrimental effects on cannas. Infected plants often exhibit stunted growth, severe leaf streaking, distortion, and mottled leaves. This viral infection poses a substantial threat to the health and vitality of canna plants, affecting their overall appearance and growth potential.