References	Culture	Training dataset	Complexitya	Number of classes	Number of images	Min–Max number samples/class
Atabay, 2017	Tomato	PlantVillage subset	*	10	19,742	373–5,357
Barbedo, 2018b	12 crop plants	Barbedo, 2016 (15% controlled, 85% in field)	*	56	1,383	5–77
Brahimi et al., 2017	Tomato	PlantVillage subset	*	9	14,828	325–4,032
Brahimi et al., 2018	14 crop species	PlantVillage	*	39	54,323	152–5,507
Cruz et al., 2017	Olive	Own dataset (controlled)	*	3	299	99–100
DeChant et al., 2017	Maize	Own dataset (field)	***	2	1,796	768–1,028
Ferentinos, 2018	25 crop species	PlantVillage dataset	*	58	87,848	43–6,235
Fuentes et al., 2017	Tomato	Own dataset (field)	***	10	5,000	338–18,899
Fuentes et al., 2018	Tomato	Own dataset (field)	***	12	8,927	338–18,899
Liu B. et al., 2017	Apple	Own dataset (controlled and field)	*	4	1,053	2,366–4,147
Mohanty et al., 2016	14 crop species	PlantVillage	*	38	54,306	152–5,507
Oppenheim and Shani, 2017	Potato	Own dataset (controlled)	*	5	400	265–738
Picon et al., 2018	Wheat	Johannes et al., 2017 extended (field)	**	4	8,178	1,116–3,338
Ramcharan et al., 2017	Cassava	Own dataset (field)	**	6	2,756	309–415
Sladojevic et al., 2016	Apple, Pear, Cherry, Peach, Grapevine	Own dataset (internet)	NA	15	4,483	108–1,235
Too et al., 2018	14 crop plants	PlantVillage	*	38	54,306	152–5,507
Wang et al., 2017	Apple	PlantVillage subset	*	4	2,086	145–1,644
Zhang S. et al., 2018	A/ Tomato B/ Cucumber	A/ PlantVillage subset B/ Own dataset (in field)	A/ * B/ **	A/ 8 B/ 5	A/ 15,817 B/ 500	A/ 366 - 5350 B/ 100
Zhang K. et al., 2018	Tomato	PlantVillage subset	*	9	5,550	405–814

^aNA, Not Applicable.

^*Complexity level allowing identification under controlled conditions.

^**Complexity level allowing identification under uncontrolled conditions.

^***Complexity level allowing the development of automatic screening tools.