EXTOJIOLOGY AND PLANT QUARANTINE 
77 
Field recoveries of two additional species have been made during the year. 
The coccinellid beetles imported from Trinidad in Jannary 1937 have appar- 
ently brought about complete control of the coconut scale in the sections where 
they have been colonized. 
COOPERATION WITH FOREIGN ORGANIZATIONS 
In cooijeration with the Entomological Branch of the Canadian Department 
of Agriculture, and with funds provided by that department, the Bureau station 
at Yokohama, Japan, collected and forwarded 213,000 field-collected cocoons of 
J)i prion nippouica Roh., the parasites from which will be utilized against the 
spruce sawfly. Arrangements were made for sending a colony of Ephialtes 
examinator F. to Canada for use against the pine shoot moth and of Hetero- 
spilus cephi Roh, for use against the wheat stem sawfly. The parasites and 
predators received from the Canadian Department of Agriculture during the 
year are listed in table 20. 
Table 20. — Para><ites and predators received from Canada during the fiscal 
year 1937 
Host 
Parasites 
Number 
received 
European cora borer Chelonus annulipes "Wesm 7, 665 
Fir bark louse (^de/^e« j9?c«ae Ratz.) Leucopis obscuriis Hal. .._| 569 
Spruce sawfly j Eient'erus ab'uptorius Thunb ' 2, 890 
Do MicToplectron fuscipennis Zett . 500,000 
Black ffrain-stem sawfly i Collyria calcitraior Grav : 5, 100 
I i 
Through the cooperation of the different divisions of the Bureau, shipments 
of parasites and predators have been forwarded during the year to the countries 
listed in table 21. 
Table 21. — Shipmejits of parasites and predators to foreign countries during 
the fiscal year 1937 
Country 
1 
Host ! Parasite 
1 
Argentina, Australia, 
Uruguay. 
Do 
Oriental fruit moth . . 
Macrocentrus ancyliiorus Roh. 
Glypta Tufiscutellaris Cress. 
Bassus dirersus Mues. 
Ascogaster quadridentata Wesm. 
ApheUnus mali Hald. 
Chelonus blackburni Cam. 
Bufo marinus L. 
Pyrophorus luminosus 111. 
Aphelinus mali Hald. 
Ascogaster quadridentata Wesm. 
Cryptolaemus monirouzieri Muls. 
Bufo marinus L. 
Pentilia castanea ZMuls. 
Cryptognatha nodiceps Marshall. 
do 
Argentina, Uruguay. . 
do 
Do 
do 
Costa Rica 
Woolly apple aphid . ... 
Egypt 
Pink bollworm ... ....... ... 
Do_. 
Mauritius . 
Mexico - . 
Cotton worm (Prodenia litura F.).. 
Cane grubs (Phytalis spp.) 
Woollv apple aphid ... .. 
Peru 
Codlinemoth. . ... 
Do 
Do 
Santo Domingo 
Do 
Mealybues (Pseudococcus spp.). 
Cane beetles (Scarabaeidae) . .. 
Coconut scale {Aspidiotus destructor 
Sign.) 
do 
CONTROL INVESTIGATIONS 
TESTS OF ORGANIC COMPOUNDS AND PLANT PRODUCTS AS INSECTICIDES 
In the te.sting of organic compounds as insecticides. ."36 were found that 
showed promise against some of the 7 leaf-eating species used for test 
purposes. It is expected that a number of these 50 compounds will be of value 
for commercial use against insect pests of crop plants. :Many of them have 
shown no injurious effects when applied to crop plants in a preliminary way. 
Three hundred compounds or preparations were tested in tins work, including 
those used in preliminary tests on mosquito larvae. 
In cooperation with the Division of Drug and Related Plants of the Bureau 
of Plant Industry, approximately preparations of plants from Puerto Rico, 
supposedly fish poison.s, were tested for insecticidal value. Except in a few 
