Many species of slugs feed on plant material and can destroy crops such as lettu

Question

Many species of slugs feed on plant material and can destroy crops such as lettuce. It is known that slugs have negative chemotaxis to certain chemical and will not eat lettuce plants sprayed with these chemicals. A currently used spray made of marigold flower extract repels slugs with approximately 75% efficiency. A new spray made of stinging nettle extract has been developed and its effectiveness needs to be determined before the company that developed the new spray can claim that it is a better alternative can be used in marketing.

Explanation / Answer

The lettuce seedlings protected by spray is 300 and not protected by sparay is 100 using Marigold spray as control. The total number of sample is 400. Therefore, the efficiency is (300/400 = 0.75) 75%.

Lettuce seedlings produced by stinging nettle spray is 304 and not protected by spray is 96. Sample size is 400. The efficiency for this group is calculated as (304/400 = 0.76) = 76%.

The efficiency of stinging nettle spray is greater than marigold spray. So, stinging nettle sparay is a better alternative than marigold spray.

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