Table 3.

Overall, comparative efficacy of different optical devices for red palm weevil infestation detection at Riyadh, Saudi Arabia.

Devices	Red palm weevil infestation detection accuracy assessment
	n	Mean ± SE
Actual	31	100 ± 0 a
Visual	31	87 ± 6 ab
Radar 2000	97	77 ± 4b
Radar 900	15	73 ± 12b
Resistograph	59	73 ± 6b

Means followed by the same letter in same column were not significantly different at α: 0.05. n = number of date palm trees observed.