Report of the Consulting Entomologist. 
843 
o nie to be manifest of encouraging preservation (or importation 
n infested screenings) of Hessian fly chrysalids. 
We are doing very well about the attack, but so far as I can 
ijudge I believe that admitting preservation of Hessian fly chrysa- 
lids, instead of destroying them by thousands when in our power 
(or letting them be so far destroyed as happens without any special 
icare in customary farm service), would be likely to cause a most 
serious increase of the infestation throughout the country. 
With regard to destruction of orchard caterpillars : From 
the reports sent me by various members of the Evesham Fruit Pests 
Committee, it appears that the application of Paris green answered 
satisfactorily where it was given in the very weak amounts carefully 
specified, and by means of such pumps as distributed it (in the 
manner also carefully specified) as a fine spray. 
In one of the last letters I received from Capt. Corbett, the Super- 
intendent of the Toddington Fruit Grounds, just before his much-to- 
be-regretted decease, he wrote me that the proportions he fixed on, 
namely, 1 oz. of Paris green to 10 gallons of water for plums, and 1 
oz. to 20 gallons of water for apples, ought not to be exceeded. He 
stated that the crop of plums at Toddington was the best he could 
hear of, and he attributed this to following the advice received. 
The result at fruit-gathering time showed his anticijjation of a splen- 
did crop to be correct. 
Capt. Corbett further stated that he believed the pest could be 
kept under, and that a more persistent course of spraying would 
have done so ; and, further, he considered that he had made a good 
beginning this year, and that next year, by reason of experience 
gained, we should do a great deal better ; " in fact," he said, " I be- 
lieve we can now keep the enemy under." 
Where the Paris green was used recklessly, without regard to 
proper proportion, and also where there was no proper apparatus to 
throw the spray as directed, the effects were decidedly injurious, 
though in some instances the trees escaped injury by reason of 
heavy rainfall washing the over-application away immediately. 
We have now proof of the great serviceableness (as well as rea- 
sons for failure in the use) of Paris green from our own British 
orchard growers' experiments, and from the great mass of reports 
which have been placed in my hands almost continuously from 
February last on the subject, I think I should be able to reply to 
any inquiries for practical purposes as to methods, and amounts, 
and cautions requisite in applications, and also as to serviceable 
home-made pumps, which would doubtless be preferred to imported 
implements. 
The above refers to Paris green only. In the recent report of 
the Evesham Fruit Committee, some of the views expressed leant 
mainly to grease-banding as the chief preventive of attack, using 
Paris green as an auxiliary ; some, more to the Paris green spraying, 
which has the advantage of destroying all kinds of moth caterpillars 
which may be present, whereas greasing only stops those of wingless 
moths. 
