Question

Wheat is attacked by many different pests, including a fungus called yellow rust.

a Describe how you could use artificial selection to produce a new variety of wheat which is naturally resistant to yellow rust.
When resistant varieties of wheat are produced, it is found that after a few years they are infected by yellow rust again. Explain how this might happen

Answer 1

Answer:Puccinia striiformis f.

Stripe (yellow) rust, caused by Puccinia striiformis f. sp. tritici (Pst), is a serious disease of wheat occurring in most wheat areas with cool and moist weather conditions during the growing season. The basidiomycete fungus is an obligate biotrophic parasite that is difficult to culture on artificial media.

Explanation:Does rust turn black?

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Rust from Iron (III) oxides with limited oxygen and low moisture results in black rust. Black rust can be visually identified as a thin, black film which is the result of oxidation in a low oxygen environment.

There are several fungicides that can be used to protect plants from infection. Mancozeb as a protectant and myclobutanil as an eradicant are generally effective against all rusts while triadimefon is effective against only specific rusts.