Answer:
Hi. You did not say whether "SA" was referring to South Africa or South America, which prevents your question from being answered. However, we can consider that line thunderstorms have very negative impacts on agriculture in any region, as they present very violent storms that can destroy crops and damage the land.
Step-by-step explanation:
Line thunderstorms are formed by instability lines of storm clouds, which create a constant storm lasting many hours, as the clouds continue to form in a constant manner and all have a large amount of water for precipitation.
This type of storm is accompanied by very strong winds and even small tornadoes. This can be very harmful to agriculture, as it floods the farmland and strong winds cause the crops to fall over, or be completely uprooted.
In other words, line thunderstorms can destroy crops and harm farmers.