CONTROL OF GIPSY MOTH BY FOREST MANAGEMENT. 39 
Stand and cutting table, Medfield, Mass. Mixed hardwood stand, one-tenth 
white oak. 
Number per acre 
Original stand. left under plan 
proposed. 
Gradual conver- 
Trees which control if in sufficient numbers. sion—succes- 
; Sive cuttings. 
Trees which 
control Other species | Number 
: present. per acre. 
on this lot. d ae Second 
(now) (in 20 
‘| years). 
Class I: 
I Reer0 Love Nee Se AN Si ene a ar os Be a Red oaks ae es 91 DON EK See nies 
TB TACK OR eae ese ere tN (oie 6 a o/h atmos cyte Black Oakes | Bese eee 29 el ae Sa ei ce 
NAA OU Re) Coe Wee IS AE ac Oa OR eS Ae et Mae Wala Ge Od keapaleree eee seh ere AB an Sats Gal Reais ae eae 
Class IT: 
AMManhie) ForbaLe SSA Cane aagobboanuabooonoECuosase Wihitepmoezs|)-eee2e. sen. 38 S2ieeeersaae 
Chestnut ye cals sleeineialee ela cuties we aage sre Chestnuts pees eee 219 TOS) |e ys ees 
Class ITT: 
VOC ITA DIOR acces Ca care ymee era Se Td eS Red maple... 6 Wa yeas hs A 
Class IV: 
BIGNESS NS RRS eA UI a ee) Ta MAL CUE Huh Rae ER ca ne) Lg a Me) Pru neetos vel LW Cs EN 
1TIn the cutting actually made on this lot, black oak was favored as an experiment, so the table does not 
in this respect conform to the practice suggested in the text. 
2See p. 39, last paragraph. 
Planting will not be necessary, but cleanings for at least five 
years (see p. 29), removing all sprouts of Class I trees, will be of 
great assistance in, reducing the amount of food available for first- 
stage gipsy-moth larve and in maintaining the altered composition 
of the stand. It should be stated frankly in this connection that the 
entomologists consider the removal of all oaks and other Class I 
trees as the safest method to follow in controlling the gipsy moth 
by limiting its food plants. The foresters, however, who are work- 
ing on the problem consider this most undesirable from the stand- 
point of management. Both agree that the help to be expected 
throughout the infested region from parasites and other enemies 
and periodical outbreaks of the wilt disease, combined with other 
measures of control, may eventually cause the gradual subsidence 
of the gipsy moth to a normal place among other injurious insects. 
Under the plan proposed, the second cutting will not take place 
for about 20 years (the end of the rotation), at which time the stand 
will be cut clear. 
By leaving the chestnut sprouts following the thinning and the 
final cutting and removing sprouts of oaks or other Class I trees in 
the cleanings, the representation of trees of this class in the succeed- 
ing stand should be much reduced. By continuing the same process 
through succeeding rotations all Class I trees may be removed, and 
the conversion to a moth-resistant, stand would be complete in 80 
to 140 years. 
