Table 4 Comparison of dry and wet barrier tests for garlic, coffee, and coffee grounds under laboratory conditions for (a) T. pisana and C. virgata and for (b) C. acuta and C. barbara.

From: Toward a push–pull strategy against invasive snails using chemical and visual stimuli

(a)

Theba pisana

Cernuella virgata

Treatments (dry vs. wet)

Cross/stop (dry treatment) vs. cross/stop (wet treatment)

χ2

P

Significance

Cross/stop (dry treatment) vs. cross/stop (wet treatment)

χ2

P

Significance

Dry garlic vs. wet garlic

0/30 vs. 3/27

1.404

0.236

NS

4/26 vs. 2/28

0.185

0.667

NS

Dry coffee vs. wet coffee

5/25 vs. 11/19

2.131

0.144

NS

4/26 vs. 8/22

0.938

0.333

NS

Dry coffee vs. ground coffee

5/25 vs. 3/27

0.144

0.704

NS

4/26 vs. 13/17

5.253

0.022

*

(b)

Cochlicella acuta

Cochlicella barbara

Treatments (dry vs. wet)

Cross/stop (dry treatment) vs. cross/stop (wet treatment)

χ2

P

Significance

Cross/stop (dry treatment) vs. cross/stop (wet treatment)

χ2

P

Significance

Dry garlic vs. wet garlic

3/27 vs. 0/30

1.404

0.236

NS

0/30 vs. 1/29

0.000

 > 0.999

NS

Dry coffee vs. wet coffee

5/25 vs. 7/23

0.104

0.747

NS

1/29 vs. 7/23

3.606

0.058

NS

Dry coffee vs. ground coffee

5/25 vs. 12/18

2.955

0.086

NS

1/29 vs. 9/21

5.88

0.015

*

  1. N.S not significant.
  2. “Cross” corresponds to the number of snails that reached the post and “Stop” corresponds to the number of snails that did not reach the post. Dry garlic treatments have been tested twice, in this table “Dry garlic” is the result from the dry barrier experiments. 30 snails were tested for each type of treatment. Chi-square test, α = 0.05; *P < 0.05.
  3. Significant values are in bold.
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