1 to 2 lainutes (Some nurse ri(_jC liave a lead of hose from the punp that could 

 directed into the tanl<:,). (G) Fill tajiic v/ith vmter. (?) Spray it out. 



t 



— E, H, "'heeler 



.:Oi L.:\i:T DI J's — Uuravele di 



Goine people are confused by the number of DIJ or dinitro spray materialo nov; 

 •■■vailable for dormant sprays. One should remember that the older tj-pe ON 

 uaterials contain dinitro-o-cresol. They are sold in the form of liquid slurric; 

 or suspensions of that salt or in the form of pmvders. Liquid fonns contain 

 20/^ of the active ingredient and are represented by such brands as Elgetol, 

 Krenite^init rosol; the powders contain 40^ of th^e active ingredient and are 

 represented by such brands as DH Dry Mix Ko. 2 and DN Dry Powder, 



These materials are compoiunded so that a quart of liquid is the equivalent 

 of a pound of the powder. Used at correct dosages tliese materials will contro-L 

 Rosy Aphis and other Aphis, Bud I'oth, and Oyster Shell Scale. They are 

 recommended for use in the dormant period and are best used alone and not in 

 combination ■■.,-ith oils because of the danger of injury to buds under some 

 conditions. (For Pear Psylla as ovicides, they are used in the t>;reen tip stage 

 when the eggs are on the spurs.) 



This year there are some new DH materials on the market. These contain tht 

 triethanolainine salt of dinitro-o-sec-butyl phenol. They are prepared in tlie 

 forra of a true solution of this dinitro compound. Used at only two quarts, thcv 

 will control the insects mentioned above with the exception of Oyster Shell 

 Scale which would require three quarts per 100. 



There is the additional advantage that these new DK materials vdll control 

 European Red Mite by killing the eggs in the dormant period. In other v/ords, 

 if an apple grovrer chooses to use one of these new Dll materials, he caii control 

 Rosy Aphis, Bud Moth, and also Red Mite with the one domant application. For 

 some growers this represents a real advantage, 



Y-Ihere Bud Moth and/or Aphis are not problems, then the "Superior" tj-pe oiit 

 are still the cheapest and most satisfactory control for European Red I.dte. 



The nevi DN insecticides described above may be used safely on pears in t.i>. 

 ::reen tip stage as recommended for pear psylla control ivith the older t^'pe Di: 

 :aatoriais, Psylla eggs are Icillod by a concentration of 2 quarts in each 

 100 gallons. 



Peach trees should not be treated v;ith the nev/ tj-pe of DN compound. 



The new Dll's arc on the market as DN-239 and as Elgetol 518. This new kir;.' 

 ^f Eigctol is what mekes the picture somev/hat confusing. The nev/ DN's are 

 somewhat more potent thon the older typos and should be used on apples in t'.\e 

 strictly dorr r ;rait on ] y. 



It is impcrtfejit for i'l-nt growcrr, to decide whicli dinitro material they 

 .'loed for their orcK%ixds and tlien to ni.-.ka cori.i.in they obtain the one decided 

 upon, 



— E. r'i, ..iiceler 



