Photoperiod controls the duration of both the fourth and fifth
stadia in Agalliopsis abietaria Oman. Development was arrested in
the fourth stadium unless short days were given during the second
and third instars; a short arrest of development occurred if the short
days did not begin until the fourth instar....
Inclusive polarized proton-nucleus scattering at 290 and 500 MeV was
performed using a ²⁰⁸Pb(51 mg/cm²) target. A broad range (0-250 MeV) of
excitation energy has been studied over the 4° - 27° angular range. The measured analyzing power and cross section of the continuum are compared with
the recent DWIA...
Experiments conducted in the greenhouse showed that the leafhopper,
Colladonus montanus reductus (Van Duzee), is a long-day
insect. This conclusion is based on the production of diapausing eggs
when the leafhoppers were kept under short days (ten hours) during
the nymphal stage and the adult pre-oviposition period. Continuous
development of...
The influence of oil sprays on the field spread of the aphid-borne
bean yellow mosaic virus (BYMV) in bean was studied in 1972
and 1973. Oil sprays failed to significantly reduce virus spread in
the 1972 BYMV experiment. However, the data did suggest that the
efficiency of the oil sprays...
The effects of the inherent transmissibility of the
virus and of the inherent transmitting ability of aphids
on the transmission of bean yellow mosaic virus (BYMV)
were studied along with four virus-vector relationships of
BYMV and the green peach aphid, Myzus persicae (Sulz.).
In addition, investigations were made on the...