Table 1.

Prevention of red turpentine beetle attacks on Monterey pines at Point Reyes-Olema, California in 1992 and 1993.

Year	Treatment	No. of trees		Duration of tree protection (days)	Cumulative no. of attacks in infested trees	No. of attacks per tree ()
Year	Treatment	Treated	Infested	Duration of tree protection (days)	Cumulative no. of attacks in infested trees	No. of attacks per tree ()
1992	Sevimol 4	24	4	84	15	1.4^{^a}
	Sevin 90 DF	24	5	42	24	2.2^{^a}
	Sevin 80 WSP	24	5	49	29	2.6^{^a}
	Control	24	14	14	136	9.4^{^b}
1993	Sevimol 4	80	7	98	16	0.9^{^a}
	Dragnet	80	1	147	3	0.3^{^a}
	Control	80	27	28	154	6.7^{^b}

↵^a,b Values for number of attacks per tree followed by the same letter are not significantly different at the 5% level according to Duncan’s multiple range test.