-23- 
IN SECTS AEEECTING GREENHOUSE 
AND ORNAMENTAL PLANTS 
APHIDS (Aphiidae) 
Delaware. M. D. Leonard (Jan\iary If): An occasional alate of 
Rhopal o s iphum rufomaculatum Wilson, only 10 in all, collected at 
Wilmington , in examining a numUer of small greenhouse chrysanthemum 
plants, which were somewhat infested with Macro siphoniella sanhorni 
Gill., and to a much less extent with Aphis gossypii Glov. (January 31)* 
Only light to moderate infestations of M. sanhorni maintained on 
greenhouse chrysanthemioms at Wilmington during the month, although 
there seemed to he little parasitization. Light infestations of 
A. gossjrpii intermixed d\iring the month with M. sanhorni on chrysan- 
themum plants, hut on a few plants or on some lea.ves, nearly all were 
A. go_ssyp^, which became heavily parasitized hy L^^siphlehus t estaceipes 
Cress. (Det, hy C. E. W. Mueseheck. ) A moderate infestation of 
A. gossypii on many potted calendula plants in this greenhouse through- 
out the month; often considerably parasitized. Potted greenhouse 
cucumber plants more or less infested with A. gossypii, and many young 
to medium-sized potted mustard plants were also modWately infested hy 
a mixture of A. gossypii and Myzus porsicao Sulz. Heavy infestations 
of_A. rumicis L. readily built up on nasturtiums during the month, 
with light intermixtures of H. persicae . (February l6) : During the 
last 2 Y^/eeks, M. persica.e has boon gradually increasing on many green- 
house nasturtium plants infested formerly with almost pure cultures of 
Infestation of potted mustard plants with M. persicae 
has built up recently until large loaves are nov/ heavily encrusted 
with aphids on the undersides. Only occasional alates have developed. 
(February 23); During the last 2 weeks, light infestations of A. 
rumicis have become established on the leaves of severa.1 gladiolus 
plants in a section of the greenhouse in v/hich nasturtiums were heavily 
infested for some time. A few days ago mustard loaves heavily infested 
with M. persicae were laid near a number of small nasturtium plants in 
the greenhouse. The aphids reo^dily left the wilting mustard leaves for 
the nasturtiums, so that now^ the undersides of all the leaves are 
heavily infested. 
Nebraska. M. H, Swonk (February 20): Reported on November 18, 1939, from 
Sarpy County that aphids VYcre attacking some house plants. 
FICKLE MIDGE ( Sciara inconstans Fitch) 
Nebraska. M. H. Swenk (February 20): Complaint from York County on 
February 4 of house plants being infested. 
FLOWER THRIPS ( Frankliniolla tritici Fitch) 
Florida. J. R. Watson (February 21): The Florida flower thrips are very 
scarce. There is practically no bloom on which thej?’ could live. 
