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Atylosia were compared and podfly and borer<br />
damage was least in crosses with Atylosia scarabaeoides<br />
(Table 28). Some antibiosis in A. scarabaeoides<br />
to Heliothis armigera was also found.<br />
When compared with those fed on pigeonpea,<br />
the period of larval development was extended<br />
and weights were lower in larvae and pupae when<br />
the insects were fed on A. scarabaeoides (Table<br />
29). In this regard, A. sericea was intermediate<br />
between A. scarabaeoides and the pigeonpea<br />
check.<br />
confirmed during the 1976-1977 year. We plan<br />
more detailed analyses of the Atylosia species<br />
themselves and are attempting to make crosses<br />
among the species, as well as additional crosses<br />
with Cajanus. At present we have 10 Atylosia<br />
species available (Table 30). The most recently<br />
collected, A. cajanifolia, appears to be the closest<br />
wild relative of Cajanus. It was collected in the<br />
Bailadilla Hills in Bastar district of Madhya<br />
Pradesh. A. rugosa, also added during the year,<br />
was collected near Ootacamund in Tamil Nadu.<br />
Intergeneric Hybridization<br />
We reported last year that derivatives from<br />
crosses of pigeonpea with Atylosia species were<br />
high in protein percentage. These results were<br />
Screening for Soil Factors<br />
Screening for waterlogging tolerance under field<br />
conditions was unsuccessful. Chambers have<br />
been constructed for this purpose, and tech-<br />
Table 28. Pest damage in derivatives of intergeneric hybrids (F 6 ) grown without insecticide use.<br />
Borerdamaged<br />
pods<br />
Podflydamaged<br />
pods<br />
Mean<br />
plant<br />
yield<br />
(%)<br />
(°/o)<br />
(g)<br />
C. cajan x A. lineata<br />
C. cajan x A. scarabaeoides<br />
C. cajan x A. sericea<br />
Pigeonpea check<br />
59.8<br />
50.4<br />
56.3<br />
57.5<br />
6.4<br />
6.1<br />
8.1<br />
17.4<br />
5.2<br />
6.9<br />
8.0<br />
12.7<br />
Table 29. Development of Heliothis armigera Hub. immature stages feeding on Atylosia scarabaeoides,<br />
A. sericea, and a pigeonpea check.<br />
Larvae a<br />
Pupae a<br />
Food plant<br />
3rd instar<br />
length<br />
Larval<br />
weight<br />
Larvaldevelopment<br />
period<br />
Weight<br />
Pupal<br />
period<br />
(cm)<br />
(mg)<br />
(days)<br />
(mg)<br />
(days)<br />
A. scarabaeoides<br />
A. sericea<br />
Pigeonpea check<br />
2.3 133.4<br />
2.7 201.3<br />
3.2 321.8<br />
31.8<br />
29.5<br />
26.8<br />
186.1<br />
209.3<br />
276.8<br />
12.9<br />
13.8<br />
13.9<br />
a Average of 12 insects.<br />
83
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