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F. Control if introduced and eradication found to be impracticable. 
1. Are effective heat or chemical treatments known? 
2. Are resistant varieties of the host available? 
3. Would sanitation provide effective control? 
U.» Would crop rotation give control? 
5« Would climatic conditions of our host producing areas 
tend to restrict or accentuate losses frcm the disease 
or would only parts of this area be affected? 
6. Probable cost of control if lOOfo and of control plus 
losses if less than lOO^S commercial control is 
practicable* 
6« International aspects. 
1, Importance of material concerned to the covuatry of 
export. 
2. Policy of country of export (some countries resent 
quarantines, some may consider them auxiliary tariffs 
to be manipulated accordingly, others must sell to us in 
order to buy frcm us.) 
Very general information is all that is required regarding 
the importance of the plant (heading A) in most cases and will be 
obtainable from other bureaus in case of doubt as to the approximate 
facts and figures. Information as to international aspects (G) will 
come from the State Depar-tanent in part perhaps but will usually be 
sufficiently well known to the quarantine administrators in advance. 
More accurate and detailed information is needed under the five 
headings B to F and it is this information which the pathologist must 
assemble and evaluate. 
In the case of a newly discovered disease information may be 
too fragmentary to make any accurate or assured determination of its 
status possible. Under such circumstances the tendency will be to 
recranmend maximum quarantine protection until sufficient information 
is available to show the importance of the disease and the probability 
and means of its introduction. Failure to invoke maximum quarantine 
protection measures might result in introduction of the disease and 
expensive eradication or pennanent control measures. It is easy to 
eliminate unnecessary restrictions but some diseases are extremely 
difficult to eliminate. 
In addition to decisions as to new diseases which might 
require quarantine action and as to whether new inf onnation warrants 
changes in the quarantine restrictions imposed in the past on account 
of well known plant diseases, there are numerous requests for 
decisions with respect to unusual materials, materials from unusual 
sources, materials given new or little known treatments, materials 
desired for scientific or educational or display, or medicinal, or 
