- 21 - 
California 
As it appears in most groves. Just now I would rather not pre- 
dict the effect of this pest upon this coming crop, hut it looks 
as if it would materially reduce it. The weather last year was 
much "below normal, while this year it has "been much above normal. 
Although there aro more than a dozen predacious enemies at work 
upon this aphid, they seem to "be absolutely powerless to stop its 
multiplication. It is a general consensus of opinion that the 
aphids are not as abundant as they were last year where the in-, 
festation was the greatest. In one grove I found that this 
insect had "been completely wiped out "by what I presume was a most 
virulent fungus. 
BLACX CITRUS APHID ( Toxopteia aurantiae Koch ) 
E. A. McGregor (March): Since the development of the new spring 
growth on the citrus trees in the Porterville region the black 
citrus plant louse has been much in evidence. The occurrence 
this season of this pest amounts practically to an outbreak. It 
is rather too early yet to estimate how severe the attack on cit- 
rus may amount to, but in the past it has occasionally "been res- 
ponsible for the complete destruction of the new growth of the 
season. 
ORANGE THE IPS ( Euthrips citri Moult on) 
California E. A. McGregor (March): Regarding minimum temperatures, the 
winter of 1924-25 was a rather mild one in the Porterville dis- 
trict, contrasting with the very cold winter of 1923-24. This 
will afford an opportunity of further studying the relation of 
winter conditions to- thrips abundance the following season. The 
first larvae were seen on March 2 this year, which is four days 
later than the earliest record for 1924. 
GRAY SCALE ( Coccus pseudomagrioliaram Kw. ) 
California E. A. McGregor (March): The unseasonably warm weather of the 
past ten days has greatly accelerated the growth of the maturing 
gray scales on citrus in the Porterville region. This points to 
an early hatch, and if. this proves to be the case it will have a 
bearing on the spring control of the citrus thrips by advancing 
the date for thrips spraying. 
FIG 
Mississippi 
TKRES-LINED FIG BORER ( Pytchodea trilineatus L. ) 
R. W. Harned (March 25) : Mr. Troy Thompson, of the U. S. Bureau 
of Entomology, has found fig trees at Bay St. Louis practically 
killed by borers that have been tentatively determined as this 
species. 
UBRARY 
STATE PLANT BOARD 
