Bulletin of the National Research Centre

Table 2 Percentage of increase or decrease in population densities of Coccinella undecimpunctata adults in untreated and sulfur-treated marrow cultivations

From: Impact of sulfur dust application on the abundance of two important coccinellid predators in marrow fields

Inspection periods (hours)	First area		Second area
	Treated plot	Untreated plot	Untreated area
	% Increase/decrease
(−) 0	–	–	–
(+) 2	− 58.02	+ 62.64	+ 63.53
(+) 12	− 48.15	+ 80.22	+ 71.76
(+) 24	− 43.21	+ 70.33	+ 81.18
(+) 48	− 14.81	+ 38.46	+ 9.41
(+) 72	+ 6.17	+ 1.10	− 7.06
(+) 7 days	+ 25.93	− 23.08	− 36.47

Before application (−), after application (+)

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