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Rhizoecus coffeae Laing >vas found on coffee roots at San Ysidro de Alajuela, 
May 28, 1932, where it was doing considerable damage. It was attended "by the ant 
Lasiuis ^ fltiYus nearcticus Wheeler. 
During early November Saissetia hemisphaerica Targ. was reported as injuring 
the tender growth of isolated orange trees. It was also reported throughout the 
winter and early spring from croton, Poncirus trifoliatus , soursop, Pouteria 
caimito , cashe?;, citron, mandarin, persimmon ( Diospyros keki and D. vi_rgin iana) , 
and "balsam ( Impatiens balsamina ) . 
Saissetia nigra Nietz, was found on soursop ( Annona muricata ) at El Cacao 
on April 24, 1932, causing deformities of fruit. 
Saissetia oleae Bern, was found on coffee, orange, cherimoya, persimmon (D. 
virginian a) , and tangelo, daring the late winter and early spring. 
Tr i o nymu s s ac c ha r i Ckll. was abundant on sugarcane during mid-November, and 
was attended by the ant Wasmannia auropunctata Roger, which lives in colonies 
between the stalks and the leaf sheaths. 
ALEURODIDAE 
Aleurocanthus woglumi Ashby is always present on orange. It was also 
collected during late winter and early spring on avocado, croton, malacca pear 
( Eugenia malaccensis ) , roseapple ( Eugenia jambos ) , lemon, mandarin, mango, citron, 
grapefruit, pitanga, and ylang-ylang. 
APEIIDAE 
During late April, 1932, Aphis g ossypii Glov. was found on the leaves of 
Hibiscus rosae . It was attended ^oy the ants Boryroyrmex pyramicus Roger -and 
Soienopsi s geminata Eab } During November this aphid was found to be doing damage 
to avocado. 
Throughout the winter from October 1932 to February 1933 Aphis illinoisensis 
Shimer ^was an important pest of grapes. 
Aphis pomi DeG. was numerous during November on apples, pears, and quinces. 
It is considered as the worst enemy of quince at San Pedro de Montes de Oca. 
Eriosoma lani^erum Hausm. was reported early in March, 1933, as being 
particularly harmful to apple. 
The chermid Freysuila ernstii Schwarz 3 was found killing small trees of cedar 
( Cedrela glaziovii var . pub e nil a) on the school ground at San Pedro de Montes de 
Oca from August to November. It was being attacked by the ladybird Ne da retro spi - 
ciens Cr. Daring the early spring it was found on Cedrela montana var. mexicana 
which it was also damaging. 
Rhopalosiphum pseudobrassicae Davis is an important winter pest of mustard. 
^ LIBRARY 
(1) Det. W. M. Mann. (2) Det. P. W. Mason. (3) Det. P. W. OmaiOTATE PLANT BC 
