1937] 
SEKVICK AND RHOULATORY ANXOUNCEMKNTS 
261 
Citrc of plrnitfi after trcdtnioit. — The insect icidal action of the g^js is completed 
at the end of the period of ti(vitnient. It is advisahle to avoid excessive water- 
ing of the plants after removing them from the treated soil in order to permit any 
residual gas to escape from the plant balls. Saturating tlie balls with nvater 
tends to prevent the escape of this residual gas and may cause some injury to the 
plants. It is possible to handle the plants after treatment by the usual nursery 
procedure, providing care is taken to avoid reinfestatlon. 
Table 5. — Dosage, temperature, and exposure requirements for paradichloro- 
henzene to destroy larvae of the Japanese beetle hy horizontal diffusion of 
the gas through plant balls of different loidths 
Diameter of the plant balls 
(inches) 
Up to 2. 
2-4. 
4-6. 
Crystals 
per cubic 
yard of 
plunging 
soil 
Pounds 
6 
10 
20 
1 
5 
10 
20 
1 
5 
10 
20 
Treatment required when the minimum temperature is 
within the range of— 
45°-49° F. 
50°-54° F. 
55°-59° F. 
60°-64° F. 
65*'-69° F. 
70°-74° F. 
Days 
Days 
Days 
Days 
Days 
Days 
9 
10 
9 
7 
5 
7 
6 
5 
4 
2 
7 
6 
5 
4 
3 
2 
5 
6 
4 
3 
2 
1 
10 
8 
6 
10 
10 
9 
4 
9 
8 
8 
6 
3 
7 
7 
6 
6 
5 
2 
9 
6 
7 
4 
8 
7 
' Leaders indicate that the exposure is more than 10 days. 
Varieties of plants. — In addition to the varieties of azaleas — Azalea hinodigiri, 
A. amoena, A. obttisa kiusiana var. Coral Bells, A. kaempferi vars. Cleopatra, 
Fedora, Othello, and Salmon Beauty, for which the treatment was originally 
recommended, the preliminary experiments indicate that the following varieties 
of plants might be treated satisfactorily by this procedure: Anemone hupeheusi^'i, 
Acquilegia sp. var. Mrs. Scott Elliott's hybrid, Artemisia drarunculns, Aster al- 
pinis, Campanula medium, Ceratostigma plumbagiiioides. Chrysanthemum sp., 
Dianthus caryopli ijlhis var. Abbotsford Pink, Digitalis purpurea, Eupatorium 
coelestinum, Hclianthcmum glaucum croeeuin. Iberis antara, Myosotis sp., Pachy- 
sandra terniinalis, Phlox sp. var. R. P. Struthers, Snniolina chamaeeyparissus 
incana, Sediim acre, Sempervirum alberti, Stokesia laevis, Thymus serpyllum, 
Viola sp. var. Jersey Gem, and Viola sp. var. Rosina. 
Tlie treatment of the following varieties of potted plants by this procedure is 
still somewhat doubtful: Cerastium biebersteini, Delphinium grandiflorum 
chinense, Fragaria sp. vars. Bun Special, Dorse, Fairfax, and Joe, Limonium lati- 
folium, Papnvcr nudicaule, P. orientale, and Primula veris. 
Lee A. Stoong, 
Chief, Bureau of Entomology and Plant Quarantine. 
B. P. Q. 359, Supplement No. 3. " 
INSTRUCTIONS TO INSPECTORS ON THE TREATMENT OF NURSERY PRODUCTS, 
FRUITS, VEGETABLES, AND SOIL, FOR THE JAPANESE BEETLE 
December 20, 19S7. 
Section II of Circular B. P. Q. 359 entitled, "Instructions to Inspectors on the 
Ti-eatment of Nursery Products, Fruits, Vegetables, and Soil, for the Japanese 
Beetle," is further supplemented as follows : 
II. Treatment of Soil About the Roots oi- Plants 
G. FUMIGATION OF STRAWBERRY PLANTS FOR JAPANESE BEETLE LARVAE 
The treatment outlined herein may be employed as a basis for certification of 
strawberry plants under regulation 6 of Quarantine No. 48 (twelfth revision). 
