Psyllidae 
Faratrioza cockerelli (Sulc), the potato psyllid,, or tomato psyllid 
The Ner; Mexico Agricijltural Fxceriment Station (208) in 1954 recorded 
the results of spraying experiments /or control of the potato psyllid in 
the field. Comparisons v:ere made of bordeaux sprays, bordeaux-oil-nico- 
tine sprays, and bordeaux-rotenone sprays. Irish Cottier potatoes 
at Bluev.ater, N, Mex., arere treated v,dth the acid-mercury dip a planted 
on the horticultural and Stith Farms on February 27, 1333. One secti< 
of the potatoes at the Horticultural Farm vras sprayed three time ~ ' bh a 
5-5-50 bordeaux mixture, another -.1th bordeaux mixture containing 1 
of Volck oil and 1 pint of nicotine sulfate to each 100 gallons of s; r .y 
material, and the third plot -..1th a 5-5-50 bordeaux rixfvre to - ' c~ . 
been added 1 pint of rotenone extract. The potatoes on the Stith Far 
v/ere sprayed r.ith oil-nicotine and the bordcaux-oil-nicotine. There ". s 
a very noticeable difference in the yield between the sprayed and unsprayed 
sections, as shear, by the following data: 
Yield of potatoes per acre 
Bo.'T HbV'Y 
Treatment grade j rade Cull 
Pounds Pounds 
Bordeaux only ~T,4l3 919 
Check, not sprayed ----- 1,033 392 
Bordeaux, oil, and nicotine- 2,478 1,219 
Check, not sprayed 1,679 1,002 
Bordeaux and rotenone- - - - 2,033 1,131 
Check, not sprayed ----- 2,112 1,130 
Psylla pyricola Foerst,, the pear psylla 
Neoton (derris extract in fish oil), 15C gra. plus taice its v/eight 
of soap in 40 imperial gallons water, killed 100 percent. — Institute 
Physical and Chemical Research ( 132 ) in 1927. 
Van Buren (286), in ansv. r er to questi as sent in by growers at the 
York Horticultural Society Annual Meeting in 1923, stated t] 
Derris ol "as effective for the control of -pear psylla, 
Hartzell (145) in 1930 reported that when a commercial pear orchard 
infested with nympns of the five ir stars of t] r psylla ; ed 
by means c." a large sore;-' rig maintaining 330 pounds pressure, D r 
1:533 alore vas not very effective (53 percent 'rilled) But t] : Lon 
of bordeaux brought the killing efficiency equal (92 percs t ki] i) to 
■ of the regular spray, -ehich consists of 2 pounds of corper sulfate, 
40 pounds of Iterated liee, ant 1 pint oi nicotine sulfate to 100 pallors 
of v/ater. 
Trees ax re treated vlth a dust contain: rts of derris (3.95 
percent rotenone) end 75 parts oj -. Most of the ueults flea- away 
and es'caoed at the time of dusting a lost cl those aid fall re< v ■ 
later. Bymphs mere very sloa- in dropping and Bat ft dropped at the 
end of 24 hours. Two veeks after treatmei : ris-treatcd trees vrere 
practically free from nymphs, which rere still a check trees, — 
Felsall and Stultz (170) in 1937. 
